Add support for frac data

[mraspaud]

This PR adds "FRAC" to the list of supported transfer modes for LAC data.

[codecov]

Codecov Report

Merging #115 (d615d1f) into main (fe4b883) will increase coverage by 0.92%.
The diff coverage is 100.00%.

❗ Current head d615d1f differs from pull request most recent head 2ecad40. Consider uploading reports for the commit 2ecad40 to get more accurate results

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   72.93%   73.85%   +0.92%     
==========================================
  Files          32       30       -2     
  Lines        2830     2689     -141     
==========================================
- Hits         2064     1986      -78     
+ Misses        766      703      -63     

Impacted Files	Coverage Δ
pygac/lac_reader.py	94.73% <100.00%> (+15.78%)	⬆️
pygac/reader.py	79.43% <100.00%> (ø)
pygac/tests/test_reader.py	98.31% <100.00%> (+0.04%)	⬆️
pygac/__init__.py
pygac/utils.py

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[mraspaud]

@helgaweb any comments?

[helgaweb]

@mraspaud Looks good.
You might want to change the documentation here as well

pygac/pygac/reader.py

Line 223 in fe4b883

def _validate_header(cls, header):

[mraspaud]

thanks!

[sfinkens]

Nice, now we can read FRAC files!! 🎉

[sfinkens]

LGTM, thanks a lot for this nice feature!