[pyramid] Rename paste app factory to pyramid_main Making it clearer that this would build a Pyramid application, just in case we eventually provide other means to create a WSGI application than Pyramid.

etc/init.d
etc/cubicweb.d
etc/bash_completion.d
usr/bin
usr/share/doc/cubicweb-ctl
var/log/cubicweb
var/lib/cubicweb/backup
var/lib/cubicweb/instances