Add service status check: uploading not possible when service isn't accepting sessions.
Also show MOTD received from the server.

Various cleanups and small fixes.

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4748 96b784f8-4ae3-dd11-aff7-0030488c597c
*Another try at fixing the "multi materials with custom pov" code bug

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4749 96b784f8-4ae3-dd11-aff7-0030488c597c
workaround for exception adding in editmode, for now setting vertex groups is unsupported in editmode.
support could be added through bmesh.


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4750 96b784f8-4ae3-dd11-aff7-0030488c597c