Make the olci l2 mask a bool array instead of floats

[mraspaud]

• Tests added and test suite added to parent suite
• Tests passed
• Passes flake8 satpy

[mraspaud]

@JohannesSMHI you might want to take a look at this.

[coveralls]

Coverage increased (+0.01%) to 85.364% when pulling 21e44fb on mraspaud:fix-olci-mask into 95b0aea on pytroll:master.

[codecov]

Codecov Report

Merging #923 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #923      +/-   ##
==========================================
+ Coverage   85.35%   85.36%   +0.01%     
==========================================
  Files         174      174              
  Lines       26037    26053      +16     
==========================================
+ Hits        22223    22240      +17     
+ Misses       3814     3813       -1

Impacted Files	Coverage Δ
satpy/tests/reader_tests/test_olci_nc.py	94.28% <100%> (+1.06%)	⬆️
satpy/readers/olci_nc.py	48.33% <100%> (+4.9%)	⬆️
satpy/readers/__init__.py	93.07% <0%> (-1.21%)	⬇️
satpy/scene.py	90.47% <0%> (-0.18%)	⬇️

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[djhoese]

Nothing seems unreasonable here. A little confused by how this format is structured, but the code makes sense.

Is % 2 equivalent to & 0b11?

Edit: Or maybe 0b01?

[mraspaud]

yes it's equivalent, haven't checked the performance though.