CCNX Formula:

* added initial CCNX script

* added dependencies. some CCNX dependencies still remain

* added more dependencies

* added homepage

* added notes for options

* added version

* conditionally install libxml2 if someone is running leopard

* libxml2 should already be installed in OSX and this may conflict

* tweaked #install method and added notes for using options

* removed auto-gen comments

* added recommended dependencies

* added CC flag to arguments

* added flags & options for x86_64, i386 and ppc

* added notes after __END__ tag