[cwctl] allow overriding config settings from the command line (closes #5557656)
eg.
cubicweb-ctl start -p port:8082 myapp
to overload the port parameter defined in the all-in-one.conf file.
\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
syntax: regexp
.*/data.*/database/.*\.sqlite
.*/data.*/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
data.*/pgdb.*