Anpassung DBConnector, LoginSQL, SuchenSQL
Merge remote-tracking branch 'origin/TankstellenDBSem1' into
TankstellenDBSem1

Conflicts:
	Tankstellen-DB/src/de/hsqldb/Datenbank/DBConnector.java
	Tankstellen-DB/src/de/hsqldb/Datenbank/LoginSQL.java