2. Fix pit BC always decommissioning the pit in old saves.

Factor out the "usual" nonassignment sex block from saRules, with variant text for jobs that need it.  Some jobs are special and don't call this code because they use totally different release logic (Clinic, Cellblock, Master Suite, etc).

Remove $pornFameBonus global (moving to saVars).  Remove FutureSocieties.ChangePorn (which only had one remaining call site) to help ensure that nobody accidentally tries to access pornFameBonus when it's out of scope.