projman #2540 refactoring the command line options [resolved]

Today, you type projman -s to make a schedule and you have then access to another set of options (specific for the scheduling).

We should better use a schedule (or sch) keyword and type projman schedule (and then the options).

See also the impact on logilab.common.configuration (use it and add the missing functionnalities).

done in0.12
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