Stamina and running.

http://smf.cataclysmdda.com/index.php?topic=6825.15

It would be fine for some monsters to run, but not zombies, triffids, or
fungals, all of which shamble to some degree.  I don't know if it's valid
for insects to sometimes sprint, I was under the impression that they tend
to just run full tilt all the time.  Monsters for the most part won't tend
to conserve energy except by not moving, so if we gave them stamina as
well, it would be simpler to just have them run all the time and lose
stamina on turns where they move.  Regardless, I don't see that blocking
this PR.
The point of the move penalty is for most monsters* to move faster than the
player when the player is walking, which if I remember correctly means 40
is the minimum penalty that will make it happen, since an average zombie
has a speed of 70.  The alternative is to inflate all monster speeds by a
similar amount, which is simply a much bigger pain to do.
The only thing I can think of to address the 'time to cross the road' issue
would be to redefine how long a turn is, probably down to 1 turn = 1
second, but then that might** require rebalancing all move costs throughout
the game.  That's a desirable thing to do, but it's not anywhere near the
top of my list of things to fix, and I don't think it should be a blocker
for this PR.

*There are a number of 'slow' monsters that should move slower than the
player's walk speed by default, off the top of my head, shoggoths, sludge
crawlers, and crawler zombies.  A handful of monsters should be slightly
faster than the player when running, mostly all dogs and quite a few of the
natural animals.
** I just now thought of an alternative, which is to simply adjust the
calendar to make 1 turn = 1 second.  This would probably also require
adjusting durations of most long-term actions, since they're intended to be
expressed in wall-time (minutes), not turns, this would avoid needing to
adjust move costs for most ad-hoc 'one to a few turns' actions.  Another
nice thing is it would preserve the 100 moves = 1 turn, which is a pretty
decent ratio to work with.