Improved TestHelperTest test for AssertImagesAreEqual, so that it isn't dependent on the images being square. Refactored DataGridViewColorCellTest a bit.
Related to Issue [
WTI-1071]
git-svn-id:
https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@7749 5a3db67b-de53-47b5-99c8-a1c30a6650e2
Former-commit-id: 2284c72fd885c962e862f75be2df25ba39adbf95
Former-commit-id: 6a7800952d646e8d9dd000978d18b923f336c1fe