Removed the "Do you really want to quit dialog" when closing the window or quiting the application via the menu.
Removed the "Do you really want to quit dialog" when closing the window or quiting the application via the menu.

svn path=/trunk/; revision=8995

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot