ripped out DBAdapter (PersistentObject and DBConnection left in until sure that not needed) and removed methods using/building up on DBAdapter, docs, tests, etc
Removed DBConnection, and methods using it, TOPPView buttons, etc
Removed PersistentObject, and uses etc of it. DBRemoval should be complete
removed oxygen entries
Removed db from ToppView Preferences. Removed overlooked DB tests
DB_TEST FLAG aus doku entfernt, nehme an dass es sich auf die DB Klasse bezieht.
Put VisualStudio error question back into FAQ
doku fixes, remove QtSql from src/openms/cmake_findExternalLibs.cmake .
Merge pull request #765 from FabianAicheler/feature/DB_removal

[FEATURE] removed database support