Evaluate loaded wavepackets

[raoulbq]

Evaluating wavepackets loaded from hdf5 file fails on grid objects.
This is a very strange bug with isinstance and module scopes.

Newly created:

<class 'WaveBlocksND.TensorProductGrid.TensorProductGrid'>
<WaveBlocksND.TensorProductGrid.TensorProductGrid object at 0x5463490>
WaveBlocksND.Grid

Loaded:

<class 'WaveBlocksND.TensorProductGrid.TensorProductGrid'>
<WaveBlocksND.TensorProductGrid.TensorProductGrid object at 0x5463490>
Grid

Given class is not a subclass instance in the second case!

[raoulbq]

Workaround:

HAWP.evaluate_at(GRID.get_nodes(), ...)