Make bl_scrunch work

[texadactyl]

The bl_scrunch utility was failing to update the output file header nchans field (number of fine channel frequencies). This field is now calculated based on the -f parameter.

Also, removed the obsolete match_fils.py and all references to it.

[codecov]

Codecov Report

Merging #277 (3b3f197) into master (93901ff) will increase coverage by 0.81%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master     #277      +/-   ##
==========================================
+ Coverage   82.96%   83.78%   +0.81%     
==========================================
  Files          73       71       -2     
  Lines        3934     3849      -85     
==========================================
- Hits         3264     3225      -39     
+ Misses        670      624      -46     

Impacted Files	Coverage Δ
blimpy/__init__.py	82.60% <ø> (-0.73%)	⬇️
blimpy/io/hdf_writer.py	71.30% <50.00%> (-0.38%)	⬇️
blimpy/bl_scrunch.py	79.48% <71.42%> (-3.85%)	⬇️
setup.py	100.00% <100.00%> (ø)

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