Particles: patch #35205 by Jakub Zolcik

The Emission panel now has a Use Modifier Stack option to emit particles from
the mesh with modifiers applied. Previously particles would only be emitted from
faces that exist in the original mesh. There are some caveats however:
http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.68/Tools#Particles

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@57055 954f8c5b-7b00-dc11-b283-0030488c597c
Cycles / OpenCL:
* Use advanced shading for nvidia as well, works fine on my Geforce 540M with sm_21. 
I tested the files from regression suite. 

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@57056 954f8c5b-7b00-dc11-b283-0030488c597c