Updates (db helper, pdf)
Database logic added
Merge branch 'master' of https://github.com/pi13/sw14_free_07.git

Conflicts:
	LVMaster3000/src/at/lvmaster3000/database/helper/HLPTasks.java
	LVMaster3000/src/at/lvmaster3000/database/logic/DBLCoworkers.java
	LVMaster3000/src/at/lvmaster3000/database/logic/DBLLectures.java