Tabbed interface: good progress

["Patrick Hallinan" <patrick j hallinan gmail com>]

Hi,

This patch:

-Fixes startup warnings
-Reverts app_init changes.
-Adds Toolbar/Statusbar show/hide to Tabbed Interface View menu.
-Removes diagram main menu from right click on diagram.

Now I'm going to work on handling app exit with multiple diagrams modified and adding the layer's dialog stuff to a tab.  

Once those are done I think that the tabbed interface will actually be usable.

Pat.

Attachment: dia.diff
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