MANUELA Code

Changed a lot things to get a better handling of invalid user input (detection, messages).
Added a method to get the MANUELA icon to display it on the frame and the task window instead of the OpenJUMP icon after a successful login.

Formated the code and comments a little bit.

Deleted an empty 'else' statement and formated the code and comments a little bit.

Fixed the bug where the Toolbox was not updated sometimes and the buttons look like they are disabled.
Added the toolbox 'updateEnableState' method to the 'selectCursorToolByGeometryType' method and changed from toolbox.validate() to toolbox.pack() in the 'buttonRemove' method.
This causes the toolbox to flicker once a new layer is selected but the strange behavior described above is gone.

Corrected only some spelling errors in comments.

Deleted some unnecessary classes because of the refactoring of the login plugin.

Fixed another archiving bug. Updating (archiving) a complete landscape element for first time in a new year lead to a SQL Exception (double Primary key) by updating all values (both, preset and arbitrary) at once. The SQL query has tried to update older (archived) values, too. Because of a missing condition in the where-clause (archivation = 0).

Moved a lot of business logic code into the new class 'N2OEvaluationService'.

Renamed the methods to archive value(s) because of typing errors.

Fixed 2 Bugs. Updating a value (both, arbitrary and preset) for first time in a new year lead to the archiving of all existing values of the selected landscape element.
So I created 2 new methods to archive only the affected value.