fixed comments and cleanup in Customer Class
Added comment and changed Modus of the balance calculation in
CustomerAbstract
added more comments to GuiCustomerList
Some changes for comments and easing up code in Pbes
Merge remote-tracking branch 'origin/benste_comments'

Solved Conflicts:
	uem.basesDeDatos.alonsostein.git/src/activity10/Pbes.java
removed warnings from DataFile with unused content