Update nfutil.py

[darrencpagan]

Update output_grain_map to take volume offsets and combines functionality to output as npz, hdf5, or vtk.

[pep8speaks]

Hello @darrencpagan! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file hexrd/grainmap/nfutil.py:

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Line 1615:20: E712 comparison to True should be 'if cond is True:' or 'if cond:'
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