Floating point comparison

[avalentino]

Use assertAlmostEqual for floating point comparison.
This fixes a test failure on debian sid.

• Tests added
• Tests passed
• Passes flake8 pyorbital

[codecov]

Codecov Report

Merging #117 (5590f65) into main (5fb4528) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #117   +/-   ##
=======================================
  Coverage   87.04%   87.04%           
=======================================
  Files          13       13           
  Lines        2054     2054           
=======================================
  Hits         1788     1788           
  Misses        266      266           

Flag	Coverage Δ
unittests	87.04% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyorbital/tests/test_geoloc.py	94.33% <100.00%> (ø)

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[djhoese]

Thanks!