Blender Git Loki

Fix T38801: Dupli objects with modifiers exhibit bad transform artifacts
in Blender Internal renderer.

The BI renderer applies modifiers //after// changing the obmat of the
respective object (for the first instance it encounters). Before
rB6940bf0 the original obmat (omat) was stored inside dupli object data,
which was removed in favor of local omat variables due to hackishness
and redundancy. Problem with BI is that all the obmats have to be
overridden in relation to each other to produce the correct modifier
results (here: offset object for the array modifier).

The patch restores the old (messy) behavior for BI by first overriding
**all** the obmats at once from duplis, then creating render instances,
then cleaning up.

A better solution would be to avoid these modifier hacks in BI
altogether and properly evaluate them in the original object space, but
that requires far greater changes to the old code base, and is out of
scope for bugfixing.