(1) Do not delete and recreate the chroot dir for every new package

    that is built.  This saves a lot of time, especiall when the
    parallelism (the number of jobs per machine, not the number of
    machines) is low.

    However, the build script only blows away /usr/local and
    /usr/X11R6, so if there is a port that does some nasty things
    outside that area, all bets are off.

(2) Better load balancing.  Now, each machine reports its own
    load in a form of a text file, which the master merely aggregates
    to pick the lowest-loaded machine(s).  Other than generally
    running faster (and more up-to-date) under loaded conditions, the
    master script will no longer hold up until a timeout when a
    machine goes down.

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