D27670: Correct bug in median computation

[Hy Murveit]

murveit created this revision.
murveit added a reviewer: mutlaqja.
Herald added a project: KDE Edu.
Herald added a subscriber: kde-edu.
murveit requested review of this revision.

REVISION SUMMARY
  When there were small ranges of values, e.g. in bias images, a lack of consistency in binning logic caused the median algorithm to fail.

TEST PLAN
  Median values will be the same for most images. 
  Some images had median calculation failures because of an off-by-one error caused by an inconsistency on bin assignment in histogram computations
  For instance, in https://indilib.org/forum/ekos/6520-median-computation-in-fitsviewer-wrong.html#50100 Herrhausen provided an image which previously
  got median values of 0. With this fix, the correct median values (768 for each channel) should be calculated.

REPOSITORY
  R321 KStars

BRANCH
  median-fix (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D27670

AFFECTED FILES
  kstars/fitsviewer/fitshistogram.cpp

To: murveit, mutlaqja
Cc: kde-edu, narvaez, apol
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