import of v0.1 tag
import of current master tip
No longer use isDeleteTemp hint.

BatchRender() will split into MakeSceneFiles() and BatchRender().  The default location for generated scene files will be hints.tempFolder.  So it won't make sense to delete that folder.
New MakeSceneFiles() creates renderer scene files but does not render.
ColladaToPBRT() returns PBRT-XML file as well as PBRT text file.