Reverting 29563 ("* Moved do_versions_ipos_to_animato from blender.c to readfile.c, where it should be.") part to the original version that (so far) is guaranteed to work fine.
While this means that "nice software design" isn't obeyed once again, this works and the other approach doesn't. So far there really isn't anything really obviously different between the approaches, even after trying a few different placements of the version patches within the file-reading internals.
ace570cb10