Expose READ/WRITE gzip consts (in addition to existing FTEXT, FEXTRA, etc)

[alexander-beedie]

Added/exposed the only missing top-level gzip consts, READ and WRITE, with the expected values. Improves drop-in completeness / replacement behaviour when substituting gzip imports with igzip imports.

(Note: all of the other public consts are already exposed/available: FCOMMENT, FEXTRA, FHCRC, FNAME, FTEXT).

Added test coverage to confirm the presence (and expected value) of all of these.

[rhpvorderman]

Looks good! Thanks! I will merge once the tests have succeeded. Can you fix the small linting error? I try to keep the library PEP8 compliant.

This should end up in python-isal 1.0. I am currently waiting for ISA-L to update to 2.31 before I release that version.

[codecov]

Codecov Report

Merging #115 (66385e2) into develop (396c1e7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #115   +/-   ##
========================================
  Coverage    98.03%   98.03%           
========================================
  Files            2        2           
  Lines          254      255    +1     
  Branches        66       66           
========================================
+ Hits           249      250    +1     
  Misses           2        2           
  Partials         3        3           

Impacted Files	Coverage Δ
src/isal/igzip.py	97.98% <100.00%> (+<0.01%)	⬆️

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[alexander-beedie]

Looks good! Thanks! I will merge once the tests have succeeded. Can you fix the small linting error? I try to keep the library PEP8 compliant.

No problem; committed the spacing fix ;)

[rhpvorderman]

Whoops, and then I forgot about this PR. Sorry not to merge this earlier.
I don't know when I can release. I have updated this library quite a bit to depend on bug fixes and build improvements in ISA-L 2.31 under the assumption that the ISA-L release was imminent. Unfortunately this has been the longest gap between releases for ISA-L yet.

[alexander-beedie]

Whoops, and then I forgot about this PR. Sorry not to merge this earlier.

No problem; it's a simple enough patch to keep in sync locally until it makes it out into the wild - thanks! ;)

[rhpvorderman]

It made it into the wild. I just released now, wheels should be available shortly. Thanks again!