Fix parabolic estimation

[mraspaud]

This should fix the parabolic estimation diverging sometimes in the next pass computation

• [x] Closes #22
• [x] Tests added
• [x] Tests passed
• [x] Passes flake8 pyorbital
• [x] Fully documented

[codecov[bot]]

Codecov Report

Merging #76 (f93f41c) into master (af4cc3c) will increase coverage by 0.01%. The diff coverage is 100.00%.

:exclamation: Current head f93f41c differs from pull request most recent head 48d7cf4. Consider uploading reports for the commit 48d7cf4 to get more accurate results

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   85.30%   85.31%   +0.01%     
==========================================
  Files          13       13              
  Lines        1878     1893      +15     
==========================================
+ Hits         1602     1615      +13     
- Misses        276      278       +2     

Flag	Coverage Δ
unittests	85.31% <100.00%> (+0.01%)	:arrow_up:

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Impacted Files	Coverage Δ
pyorbital/orbital.py	87.16% <100.00%> (-0.28%)	:arrow_down:
pyorbital/tests/test_orbital.py	95.45% <100.00%> (+0.24%)	:arrow_up:
pyorbital/tests/test_tlefile.py	97.43% <100.00%> (+0.02%)	:arrow_up:

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[dagnic]

@mraspaud Thanks for the PR and the merge into master. Do you know if it is possible to update the version available in the conda channel (https://anaconda.org/conda-forge/pyorbital)? Thanks again!

[mraspaud]

I'll try to make a release soon