Make SSRI antidepressants more realistic.

[zaimoni]

E.g., prozac. Formal adjustment at c46a09e .

This is not a proper fix; that is both too invasive within a release window, and unclear whether the extra detail actually changes casual gameplay.

• The stimulant plink (internal units +3) is now unconditional.
• In-game use now is: take the second dose before six in-game hours have elapsed (to prevent the data structures from incorrectly deleting this outright). After that, take one maintenance dose every 12 hours to keep the negative morale suppression up 24/7. (And masochism morale bonus suppression.)