More fixes in the tests.
- Removed duplication in tests; there were three login tests that all did the same. - Removed duplication in tests; there were two IVA disease creation tests, and one created an additional disease. This is confusing and useless duplication of code; split these features. - When enabling the Individual/Gender column, the test wasn't checking if that was successful. - Fixed wrong variable name in install_LOVD.php script. - The screenshot uploader now also will dump the last lines of Apache's error log, which should contain PHP errors. This may confirm my theory that the tests are failing because PHP warnings due to a WIP commit have turned into fatal errors (perhaps because of xdebug that I can't seem to turn off?).
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