GUI: Added recently closed tabs feature
Mousing over the close all tabs button brings up the popup
Added SC_HoverArea: Emits a signal when the mouse has been over the widget for a period of time
Added SC_RelativePopup: Creates a popup window whose location is dependant on the parent widget
Added SC_TabWidgetCloseAll: Made close all tabs it's own class which subclasses QTabWidget
Added SC_RecentlyCloseTab: Combines all three classes (subclasses SC_TabWidgetCloseAll) to implement a recently closed tabs popup window

git-svn-id: http://simulationcraft.googlecode.com/svn/trunk@18003 3b4652a1-8050-0410-ac47-3d40261b0f8b
GUI: Changed base class of SC_ResultTab to SC_RecentlyClosedTab

git-svn-id: http://simulationcraft.googlecode.com/svn/trunk@18004 3b4652a1-8050-0410-ac47-3d40261b0f8b
Missed some code to clean up

git-svn-id: http://simulationcraft.googlecode.com/svn/trunk@18005 3b4652a1-8050-0410-ac47-3d40261b0f8b