Make XMDS work again when MPI isn't installed.

git-svn-id: svn+ssh://svn.code.sf.net/p/xmds/code/trunk/xpdeint@2830 41b19578-b77a-4e3b-9682-c8570d237623
Version number changes for 2.1.3 release.

git-svn-id: svn+ssh://svn.code.sf.net/p/xmds/code/trunk/xpdeint@2831 41b19578-b77a-4e3b-9682-c8570d237623