[MonoDevelop] [Patch] Small fixes

[Lluis Sanchez]

Hi!

> * Clear the statusbar when a combine closes
> * Clear the build output pad when a combine closes
> * Custom popup menu for the build output pad
> only show Copy and Select All, since all other items are allways disabled

This can be done in a more elegant way by subscribing the PopulatePopup
event of TextView. You can modify the menu in the handler. There is no
need for a subclass. The other changes look OK to me.

Lluis.

> 
> -- Ben