no real changes in here
Makes usage of the argument parser JSAP now, to get a more flexible
Code.
changed some variable names to achieve a more constant nameing
Changed some Variable Names to achieve a more constant nameing
no real changes
no real changes
Changed main data type from Hashmaps to ArrayLists and changed some code
as well to integrate with the Argument Parser.

+method boolean mail_id_used(int mail_id)
	determinates if a mail_id is already in use. returns false if you
should not use this id, returns true if you can use the given id.
	
+method boolean contact_id_used(int contact_id)
	determinates if a contact_id is already in use. returns false if you
should not use this id, returns true if you can use the given id.