pyparsing has split versions above 2.0.0 to be python3 based.  Forcing a python2 compatible pyparsing when installing via waf. 


git-svn-id: svn+ssh://svn.code.sf.net/p/xmds/code/trunk/xpdeint@2814 41b19578-b77a-4e3b-9682-c8570d237623
Restoring the TOC in the sidebar.


git-svn-id: svn+ssh://svn.code.sf.net/p/xmds/code/trunk/xpdeint@2815 41b19578-b77a-4e3b-9682-c8570d237623
Updating the introduction with a brief history and the earlier references.


git-svn-id: svn+ssh://svn.code.sf.net/p/xmds/code/trunk/xpdeint@2816 41b19578-b77a-4e3b-9682-c8570d237623