Gain-one-lose-one potions behave funny on failure

[MarbleDice]

If they fail to drain a stat (because the randomly selected stat is at a minimum), they do not raise a stat, the potion is not consumed, no message is generated, and the flavor remains unknown.

[MarbleDice]

The two obvious solutions would be:

1) Attempt to raise the designated stat, pick a random stat and attempt to lower it.

2) Pick a random stat, attempt to lower it, and if successful attempt to raise the designated stat.

I think I like the second one better, but practically I don't think it makes much difference.

[MarbleDice]

[1189cd8] (SVN r1773). The potions behave thusly:

Attempt to lower a random stat (not the one the potion raises), and if successful identify the kind and attempt to raise the appropriate stat.

The potion/turn is always consumed.