* Due to buggy MySQL query plan optimizer, the existing tests overview query use incorrect execution plan which leads to long execution time. The SQL query has been changed to produce efficient execution plan. Now the overview form works correctly.
* Fixed displaying of the test category column.
* Fixed History overview.
* History form: display a error when a test file not found.
* Use MySQL 5.5 connection.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23564 3ad0048d-3df7-0310-abae-a5850022a9f2