Make the PHP highlight and align
Remove psyco support

Since Psyco is now unmaintained and dead see
http://psyco.sourceforge.net/ it is time to remove this. The projects
recommendation is to use pypy instead.
Use :wp: for Wikipedia links
Fix rST formatting in code docs
Fix links (external and internal refs)
Not needed since 59994524b2f473f7f1a79ed4fbd50738fb09732a
Add a requirements file

Transfered all recommendations and optional packages and versions into
requirements files.