[modeller_usage] Modeller 8v1 on x86_64

With the generic UNIX install of Modeller 8v1 on x86_64 RHEL 3, the site packages cannot be found:

57 scylla:/sb/apps/modeller8v1/examples/all-steps% mod8v1 search.py 'import site' failed; use -v for traceback

To work around this, I've added the following line to our mod8v1:

if test "$ARCH" = "x86_64"; then export PYTHONPATH=/usr/lib64/python2.2; fi

There may be other ways to fix it, but this worked for me.