This adds a configurable limit under which the regular worker is
unsubscribed. The regular worker is unsubscribed when the sum of his
shift counter and his compensation shift counter reach the configured
limit.
They become unsubscribe when the regular counter fall under a value that can be define in parameter
[FIX] don't show unsubscribed or resigning worker in the list of worker you can assign on a shift
Elouan Le Bars
Rémy Taymans
Thibault Francois