showErrorDialog() (in UIFacadeImpl class) needs to become more user friendly.
Therefore, it should not show Exceptions (directly) to the user.

Current idea for modification:
Only show error message in the dialog, no exception traces.
Add a link/button/something to open a text pane containing the complete error 
log including system information. In such a format that it can be directly copy 
pasted into a new issue here.

This way the the dialog is more user friendly (no more scary exceptions) and 
submitting bug should become more easy!

Originated from:
http://code.google.com/p/ganttproject/source/browse/ganttproject/src/net/sourcef
orge/ganttproject/UIFacadeImpl.java?spec=svn40904d52ee7d18ba58e315b5ab5d81cdabdf
b8f8&r=40904d52ee7d18ba58e315b5ab5d81cdabdfb8f8#279