Fix [#36848] .obj exporter messes objects normals

(Hopefully!) Logic behind normals export indices was indeed wrong when using several objects (at least, not matching vertex/uv ones).

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4776 96b784f8-4ae3-dd11-aff7-0030488c597c
Followup to r59434 : py UI scripts edits to have back alignment with controls grouped in brackets

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4778 96b784f8-4ae3-dd11-aff7-0030488c597c
Addon: Development Icon was showing labels but shouldn't (icon_only=True seems broken?!). Manually setting text="", although prop default was also "".

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4779 96b784f8-4ae3-dd11-aff7-0030488c597c