Fix floating point comparison.

[avalentino]

Testing with equality seems to cause issues with new numpy version on debian.
This patch uses numpy.testing.assert_all_close for a safer floating point comparison.

• Tests added
• Tests passed
• Passes git diff origin/main **/*py | flake8 --diff
• Fully documented

[codecov]

Codecov Report

Merging #73 (cdc9dcf) into main (5f2cb59) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   46.61%   46.65%   +0.04%     
==========================================
  Files          15       15              
  Lines        2525     2527       +2     
==========================================
+ Hits         1177     1179       +2     
  Misses       1348     1348              

Impacted Files	Coverage Δ
trollsched/tests/test_spherical.py	96.15% <100.00%> (+0.03%)	⬆️

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[mraspaud]

The spherical computation are now outsourced to pyresample and the tests have thus been removed. Closing.