updated the database to fit the provided constraints, for more detail look at file datenbankanpassungen.txt, every change is listed there
merged develop into datenbankanpassungen, conflicts have been resolved (for example new boolean-char-converter, other minor changes in the model classes), however there are still unsolved problems :( some other SD may have to look at this.
after talking to jenny, i managed to solve previously mentioned problems - so i removed malicious, unnecessary code, and corrected our testdata to fit the actual database [Employee.abbreviation has now max-length 5, so testuser1 is not valid anymore, changed to user1 etc.]
Merge branch 'datenbankanpassungen' into develop