[Gtkradiant] [Bug 715] New: Cycle select (drill select) doesn't work properly with brush based entities

[gtkradiant@zerowing.idsoftware.com]

http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=715

           Summary: Cycle select (drill select) doesn't work properly with
                    brush based entities
           Product: GtkRadiant
           Version: 1.2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: editor
        AssignedTo: ttimo@idsoftware.com
        ReportedBy: rr2do2@q3f.com


When you have the following example situation:

-------brush---------

------terrainent-----

-------brush---------

And you would try to alt+shift cycle select through the three from the top, it 
would most definately always get stuck at the terrain entity. Reason is because 
of the way cycle select works, it looks at the last brush in the selected list 
to see what was selected last in the cycle. Selecting entities with multiple 
brushes caused that brush to be the last one in the entity, not the actual 
brush that was selected. This patch fixes that.

Next to that, the patch stops brush based entities from being top selected in 
2d. This way you can actually select brushes that are above terrain entities 
etc in the 2d window.