coordinating work

[Karl Fogel <kf...@galois.collab.net>]

Had a thought to make parallelization easier.  When one of us starts
to work on a dag.c function, let's stake it out by putting a comment
like

   /* cmpilato started work on this, stay outta my way punk */

or whatever inside the function body, and immediately commit that.
Thus, if always update before starting to work on something, and also
start work by immediately committing a stakeout notice, we'll never
duplicate work.

Or we could just turn around and talk to each other, but that seems
so... extreme.

-K