What works:
The usual command line options for rendering.
All python scripts are loaded (which includes custom properties)
Render engines are loaded and can be used
-P to run scripts works partially: rna api works ok, not operators.
What doesn't:
Most operator calls in python. This is a problem with poll functions. (Brecht and Campbell are aware of this already)
Changes:
-d now also applied with -b (it was ignored before)
user file (.B25.blend) now also loaded in bg mode. This helps for custom paths and all.
wm is also initialized (it's needed for a lot of context calls)
Ghost, however, is not initialized.
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