UI / Node Editor:
* Align Render Layer menu and Render button in "Render Layers" node. 
This looks better and the settings belong together as well. 

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55413 954f8c5b-7b00-dc11-b283-0030488c597c
Fix: Clamp alpha to 1.0 or adding alpha in paint creates "isolines" due
to integer overflow. One of the beautiful bugs that is sad to see fixed.

Also remove unused timer variable

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55414 954f8c5b-7b00-dc11-b283-0030488c597c