Change the name of the configuration file option

What used to be --config is now --cfgfile, as with other Quattor tools.
Now AppConfig can parse the configuration file, fixing #9 and other
small bugs.

We could eventually get rid of the EDG::WP4::CCM::CCfg module.
Merge pull request #10 from piojo/ccm-debug-fix

Change the name of the configuration file option