Bug: cannot read gamma spectra from new fispact output

[dvp2015]

Found bug on gamma spectra reading from fispact 4 output.
The bug is reproduced in test, which was added at dvp2015 fork: https://github.com/pypact, branch gamma_spectra_read_bug
See tests/output/test_gamma_spectra_reading.py

The reason is that pypact reading is based on certain number of spaces in output, but the spaces number was changed in our fispact version.

I'm taking on the fix.

I would suggest also to introduce to pypact dependency on numpy to avoid reinventing the wheel. Anyway numpy is just necessary for further analysis modules using pypact. The implementation can also rely on numpy and, probably, xarray. But this is a subject of further issues, not this one. Let's fix the bug first.

[github-actions]

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