fix [#37100] Segfault when I rotate an edge


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@60796 954f8c5b-7b00-dc11-b283-0030488c597c
add IDP_FreeFromGroup(), replaces IDP_RemFromGroup(), IDP_FreeProperty(), MEM_freeN().


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@60797 954f8c5b-7b00-dc11-b283-0030488c597c