Unlink configuration files by module

[mindsers]

User can deploy configuration files with the config deploy command. It would be useful if we can remove/unlink a module (its configuration files) previously deployed.

Actual behavior

User can't un-deploy modules previously deployed.

Expected behavior

A new command like configfile undeploy [moduleNames...] unlink the files deployed for the modules in parameters.

[mindsers]

Accordingly to #33, in the unlinking phase file renamed by configfile as filename.old should be renamed again to their previous name.