fix [#34606] x3d file with comma separated coordinates doesn't import


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4464 96b784f8-4ae3-dd11-aff7-0030488c597c
Small changes to images as planes:
*Use absolute as default size mode (dpi with BU is not that nice).
*Use default plane primitive instead of creating our own square (this way we can be sure things like verts order will always match those of default plane!), request from Christopher Barrett in tracker.

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4465 96b784f8-4ae3-dd11-aff7-0030488c597c