I started out just reformatting the function header for regularize()
but ended up doing miscellaneous other stuff, including some code
changes. I think the CHDIR code is a bit cleaner now, but shouldn't
have any differences in behavior.
Along the way I noticed that 'nethack -dpath' or 'nethack -d path'
modifies argv[] before PANICTRACE attempted to save argv[0], so would
break having nethack invoke gdb to get a backtrace. ('ARGV0' seems to
be unnecessary since 'hname' holds the same value, but I didn't get rid
of it....)
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