Blender Git Loki

Alembic: Renamed copy_zup_yup to copy_yup_from_zup (and same for zup_from_yup)

With the new names the arguments (yup, zup) are in the same order as
they appear in the function name. The old names used copy_src_dst(dst,
src), which I found very confusing. Furthermore, now it is clear from
where to where the copy is made.

This makes the function names a little bit longer, though. If that is
a real issue, we can just name them zup_from_yup(zup, yup).

Reviewed by: K�vin Dietrich