Save/load alterations for the new morale structure.
Apply persistent morale effects more aggressively.

Optimist wasn't showing up immediately on game start, and Hoarder
wasn't updating when you examined your morale.
Extended add_morale to support the new decay model.
Extracted the logistic function cutoff, reduced it to 4.
Moodlets now last the intended 30m by default.

Specifying a parameter in turns when it's ectually in minutes doesn't
produce the results you were expecting.  Funny, that.