Small ACR update this weekend

[Zelknolf]

Not a whole lot in this one-- mostly opportunistically scooting out a few reasonably-self-contained things.

-- Custom poisons work now.
-- A fix that makes the Set Description button on PC tools call up the same GUI for editing as the context menu when brought up on oneself (that is, the one that works).
-- Creatures on BEHAVIOR_TYPE_FLANK should now try to backstab nearby people who are beating up their friends instead of attempting opportunistic strikes on distant foes (as that tends to mean doing dumb things like running through tangled melee and drawing AoOs, or drawing a ranged weapon and drawing AoOs).

At the time of this post, TSM and WHL are updated. There were people on MS and BG, so they'll get updates at the next restart.

No downloads; no recompiles. Builders don't need to do anything new this time.

[shad0wfax]

BG is updated. Thank you for the poisons and the AI!