Merge the 5 different protogeni xmlrpc scripts into a single wrapper

that loads one of five different modules, based on the PATH_INFO.  The
modules do nothing but pull in the proper library; all of the xmlrpc
and authorization code is in one place now (the wrapper), instead of
being duplicated. Much cleaner, much safer.

An update to httpd.conf is required, and done with update script 7.