add check for cmake that source files are not included multiple times


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@60924 954f8c5b-7b00-dc11-b283-0030488c597c
code cleanup and add mball select similar into the menu


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@60925 954f8c5b-7b00-dc11-b283-0030488c597c