Escorting stat, on new experimental server! Be the first admiral!

[Peter Mardahl <peterm@langmuir.EECS.Berkeley.EDU>]

boltzmann.eecs.berkeley.edu is a new public server, complete with
a custom mod.

I've implemented an escorting stat, which is used along
with planets, bombing, and offense to determine rank.

Furthermore, sc bombing is more highly rewarded.

At last, RANK for helping out your teammates!
(send yourself "stats" to see your escorting rating)

Tmode is 2 vs 2 right now:  please come by and help me evaluate
the new stat:  some parameters may need tuning, such as
the strictness of the "betweeness" criterion for dying in defense
of a carrier, the distance at which killing an opponent should
be considered "escorting" a carrier, and the relative rewards for
dying in escort, killing in escort, and being present at a successful take.

Details are on the motd!

(or at http://langmuir.eecs.berkeley.edu/~peterm/escort_stat.html)