* 1.18.0 on CRAN. Bump to 1.18.99

* bump versions

* Fix milestone link for 1.18.2

* Replace `ATTRIB`, `SET_ATTRIB` (#7487)

* frev: drop SET_ATTRIB

Instead, backport and use CLEAR_ATTRIB (R >= 4.5).

* mergeIndexAttrib: drop SET_ATTRIB

Use SHALLOW_DUPLICATE_ATTRIB (R >= 3.3) for the simple case. Also,
Backport ANY_ATTRIB (R >= 4.5) instead of testing !isNull(ATTRIB(.)).

* cbindlist: use ANY_ATTRIB

* nafillR: use ANY_ATTRIB

* Backport R_mapAttrib

* anySpecialStatic: switch to R_mapAttrib

* dogroups: construct rownames anew

Instead of trying to walk ATTRIB in search of the compact 'rownames'
attribute to modify, install it anew, take note of the returned
reference to the value being installed (a different one!) and modify
that.

* mergeIndexAttrib: switch to R_mapAttrib

* assign: factor out index fixup

Instead of walking the attribute list directly, use R_mapAttrib().
Create a hash table of index names instead of relying on chin() and a
temporary string vector. Move all temporary allocations onto the R heap.

* assign: drop indexLength

* assign: fix index unmarking

* Comments, better field names

* Update src/dogroups.c

Co-authored-by: Benjamin Schwendinger <52290390+ben-schwen@users.noreply.github.com>

* mapAttrib: protect the attribute value

Otherwise the callback could remove the attribute and end up with the
value unprotected. Protect the attribute tag as well for uniformity.

Co-Authored-By: HughParsonage <hugh.parsonage@gmail.com>

* dogroups: look up rownames using mapAttrib

This solution is closer to the working approach previously taken by the code.

* Fix comment, function name

* Protect the newly found rownames attribute

* add NEWS entry

---------

Co-authored-by: HughParsonage <hugh.parsonage@gmail.com>
Co-authored-by: Benjamin Schwendinger <52290390+ben-schwen@users.noreply.github.com>
Co-authored-by: Michael Chirico <chiricom@google.com>
Co-authored-by: Michael Chirico <michaelchirico4@gmail.com>

* use getVar over findVar (#7575)

* remove unused vars (#7578)

* Fix code blocks in NEWS.md (#7518)

Add a missing triple-backtick separator.

Separate the indented code blocks from the preceding paragraph because
otherwise Pandoc fails to realise that the whitespace followed by
triple-backtick denotes a fenced code block.

* make rchk happy (#7520)

Co-authored-by: Michael Chirico <chiricom@google.com>

* escape one frollsd tests for valgrind (#7548)

* escape one tests for valgrind

* increment skipped count

* escape proper one

* make test robust to valgrind numerical issues

---------

Co-authored-by: Michael Chirico <michaelchirico4@gmail.com>

* fix(7571): bug fix for narm issue on gforce in int64 case (#7572)

* fix(7571): bug fix for narm issue on gforce in int64 case

* fix(7571): test sequencing

* fix(7571): updated the NEWS.md

* trailing newline

* Use $V1

* fix(7571): added db optimize 2L

* refine NEWS

* fix(7571): add more tests and change to code similar to int for gsum

* fix(7571): added more tests for mean

* eliminate intermediate variable

* NEWS again

---------

Co-authored-by: Michael Chirico <chiricom@google.com>

* add @manmita (#7573)

* `utils.c`: include `<signal.h>` for `siginfo_t` (#7517)

* utils.c: include <signal.h> for siginfo_t

POSIX says:

> The <signal.h> header shall define the siginfo_t type as a structure

So <sys/wait.h> is not enough to see the definition (not just a forward
declaration) of siginfo_t.

* NEWS entry

* Amend NEWS

* more robustly define _POSIX_C_SOURCE (h/t Hugh)

* tidy up NEWS

* -D_POSIX_C_SOURCE=200809L in gitlab CI job for regression test

* revert gitlab-ci change

---------

Co-authored-by: Michael Chirico <michaelchirico4@gmail.com>
Co-authored-by: Michael Chirico <chiricom@google.com>

* Remove unrelated release notes

Amend 1c05f11: remove the notes not
relevant to the 1.18.2 release.

* Fix http -> https link that is now a redirect (#7588)

Found the following (possibly) invalid URLs:
  URL: http://stereopsis.com/radix.html (moved to https://stereopsis.com/radix.html)
    From: man/setkey.Rd
          man/setorder.Rd
    Status: 200
    Message: OK

* Fix latest rchk issues (#7585)

* attempt PROTECT for new rchk issues

* different approach for longestLevels

* use nprotect?

* no longer using names SEXP

* only UNPROTECT near exit

* no, that cant be it...

* move assignment into loop

* REPROTECT approach

* reduce diff

* reduce diff

* set automatically allocates new column slots if needed (#7538)

* set automatically allocates new column slots if needed

* use GetOption1 instead of GetOption

* fix test

* change froll test

* remove assign change

* add output statements to test loop

* add helper function

* frollmedianFast: avoid reading uninitialised array (#7589)

The 'n' array is only initialised if 'even' is true, so skip the
comparisons otherwise. Detected by checking with --use-valgrind or
performing a frollmedian() with an odd window size under R -d valgrind.

Fixes: #7546

* `setlevels()`: avoid crash on missing factor values (#7596)

Check for missing or out of bounds values and set them to NA.

* Avoid out-of-bounds access in `overlaps` (#7598)

* Add tests

* overlaps: avoid accessing length-0 vectors in ux

If 'ux' contains 0 rows, pretend that all comparisons against its
non-existent elements fail.

* overlaps: avoid 'lookup' list overflow

This used to happen when from[i] was 0. (No match on non-range columns?)

* NEWS entry

* overlaps: uncomment one more underflow test

Technically this one was harmless (and thus not caught by sanitizers)
because the preceding VECSEXP header always contained a 0, preventing
the branch where VECTOR_ELT() would be called with a negative index.

* test formatting

* Update src/ijoin.c

Co-authored-by: Benjamin Schwendinger <52290390+ben-schwen@users.noreply.github.com>

* Update src/ijoin.c

Co-authored-by: Benjamin Schwendinger <52290390+ben-schwen@users.noreply.github.com>

* Update src/ijoin.c

Co-authored-by: Benjamin Schwendinger <52290390+ben-schwen@users.noreply.github.com>

* Update inst/tests/tests.Rraw

* overlaps: uncomment the remaining underflow test

The underflow is covered by already existing tests.

---------

Co-authored-by: Benjamin Schwendinger <52290390+ben-schwen@users.noreply.github.com>

* Only export R_init_data_table (#7607)

This will avoid name clashes between data.table functions (now hidden)
and other functions in the global namespace visible to the shared
library loader.

Fixes: #7605

* `set()`: only reallocate the table if resizing would fail otherwise (#7606)

* Regression tests

* set(): only reallocate if resizing would fail

* Update R/data.table.R

Co-authored-by: Michael Chirico <chiricom@google.com>

* Rename test variables

Co-Authored-By: Michael Chirico <michaelchirico4@gmail.com>

* Cache j %chin% names(x)

Co-Authored-By: Benjamin Schwendinger <52290390+ben-schwen@users.noreply.github.com

---------

Co-authored-by: Michael Chirico <chiricom@google.com>
Co-authored-by: Michael Chirico <michaelchirico4@gmail.com>

* NEWS entry for #7607 (#7608)

* NEWS entry for #7607

* More about the problem being solved

Co-Authored-By: Benjamin Schwendinger <52290390+ben-schwen@users.noreply.github.com>

* `tests/froll.R`: disable `mcparallel` under Valgrind (#7621)

* update NEWS

* fix merge

---------

Co-authored-by: Tyson Barrett <t.barrett88@gmail.com>
Co-authored-by: aitap <krylov.r00t@gmail.com>
Co-authored-by: HughParsonage <hugh.parsonage@gmail.com>
Co-authored-by: Michael Chirico <chiricom@google.com>
Co-authored-by: Michael Chirico <michaelchirico4@gmail.com>
Co-authored-by: Jan Gorecki <J.Gorecki@wit.edu.pl>
Co-authored-by: Manmita Das <34617961+manmita@users.noreply.github.com>