don't overwrite the bake panel, instead prepend.


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4166 96b784f8-4ae3-dd11-aff7-0030488c597c
add error for animation baking a packed image.


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4167 96b784f8-4ae3-dd11-aff7-0030488c597c