Fixes addressing issues 97, 98

[gfireman]

packet_types.py: assign bit_offset for array fields
decode.py: allow processing of partial file (+spelling)
converters.py: fixed units documentation

[gfireman]

The CI checks failed on "black" reformatting. I don't have that tool. Could you handle that, please?

And python versions > 3.9 seem to handle relative imports differently, so you'd have to fix that throughout the code.

...never mind, I fixed it myself and squashed the commits.

[codecov]

Codecov Report

Merging #99 (275c244) into main (8b9619f) will decrease coverage by 0.44%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
- Coverage   95.87%   95.44%   -0.44%     
==========================================
  Files           7        7              
  Lines         654      658       +4     
==========================================
+ Hits          627      628       +1     
- Misses         27       30       +3     

Files	Coverage Δ
ccsdspy/converters.py	100.00% <ø> (ø)
ccsdspy/packet_types.py	95.26% <ø> (ø)
ccsdspy/decode.py	94.54% <40.00%> (-1.29%)	⬇️

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[ddasilva]

Thanks a ton!