use bmesh volume function, show cubit inches for volume/area statistics.


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4509 96b784f8-4ae3-dd11-aff7-0030488c597c
MHX importer made more tolerant to API changes by ignoring unrecognized expressions.

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4510 96b784f8-4ae3-dd11-aff7-0030488c597c