suzerain: #3055 rework log file separation

I previously had
    bc.dat
    L2.dat
    rms.dat
    bulk.dat
    chan.dat
    bl.dat
and under the old system was looking at adding
    min.dat
    max.dat
which was getting a touch ridiculous.

Reworked the logging system so that there's now
    bc.dat
    log.dat
    state.dat
    qoi.dat
with the prior
    L2.mean
    rms.fluct
now hitting the CONSOLE and LOG as
    state.L2
    state.RMS
and also appearing within state.dat.

This permits me to add
    state.min
    state.max
and any other derived information I like within state.dat.

The change also avoids having separate, empty chan.dat and bl.dat
appearing on every run.  Folks wishing to plot running L2 or
RMS information from the new state.dat file are advised to look
at the 'gplot -g' option and/or to use the bash function

    tgl() { pat="$1"; shift; tail -n 1 -f "$@" | grep --line-buffered $pat; }

to permit running tailing of some particular line.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44182 0bd85f0b-c151-43b9-a1e9-27231104551f