Blender Git Loki

Bugfix #5401

Material Nodes still have undefined output to the passes. Currently only
the active Material node gives pass info. Bug was that check for active
was wrong, giving stripes because of hanging variables.
I'll work soon on providing all pass options in the Material nodes. This
fix at least correctly provides passes for active material, and clears
memory of pass info in advance.

Also: outliner view "current scene" did not show render layers.
ALso: outliner click on renderlayer now activates it (for UI)
Also: zbuffer for transparent was not initialized to 'infinity' correctly