Added the class IncreaseDueActivity, added the link to the starter
(main) class, it now opens an empty window
bassically used the deposit window and corrseponding con methods, then
added some con methods based upon old con methods to make sure all the
correct things wuld be happening, did some refactoring of all the
variable names accordingly, both in the con methods that where added and
in the IncreaseDueActivity class. it now works however it does not give
an error to the user if the date is incorrect, something that quite
obviously needs to be added....
Added a small bit of code that will both tell the user and the console
that an activity is not active
Merge pull request #9 from Ylvakiller/IncreaseDueActivity

Merging of IncreaseDueActivity