code cleanup: move doxy docs from headers into source. also replace strncpy();str[len]=0 with BLI_strncpy() in BLI_stringdec().


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55545 954f8c5b-7b00-dc11-b283-0030488c597c