Tab renaming methods:
* double click the tab
* context menu on tab bar
Also:
* change initial tab name to include a number based on the total number
of tabs that have been opened.
* add tool tip to tab of the analysis type.
* add explicit close tab function to ensure analysis widgets are deleted.
1. add icons for opening policy and new analysis
2. add shortcuts for copy, cut, paste
3. add filename to apol main window title
4. fix file chooser bug for selecting a policy.
5. improved handling where new analysis is started w/o open policy
