I can't make out the different between portage.abssymlink and
os.path.realpath, besides that realpath is used a LOT more in portage
and abssympath dies if it gets passed something that's not a symlink.

Let's get rid of it!

1st patch is for trunk/pym/__init__.py
2nd patch is for trunk/pym/dbapi/vartree.py (only actual instance of
abssymlink left)

-Doug