This option come from previous behavior. It not the role of enable process
to deal with parse option.
Also, this change allow user to quickly switch between trees without the need
to force a parse process.
The necessary field at resolve file of the service is now handled by enable
process.

Do not warn the user about this feature. It only used on very specific case like module migration process.
Badly used, this features can easily broke the sanity of the system state

deprecates options -c|m|C|i at 66-enable and add option -I. Pass to the new configuration file format at ssexec_env.

adds field @extdepends. Services declared with @optsdepends are not mandatory. Services declared with @extdepends must have the frontend file installed at least