hdf5doc

Purpose:
Bug fix

Description:
On some machines, $RUNSERIAL variable needs to be used to run
tests.  Set $RUNTESTS (which is used for non-parallel tests) to
be $RUNSERIAL in configure.am.

Also, since I was updating all Makefiles.in anyway, I updated
commence.am to point to autotools installs in AFS instead of
those on heping.

Platforms tested:
mir, sleipnir, modi4, copper