Reduce the chance of a player playing on a public server encountering
their own bones, by implementing separate bones pools. The pool a player
belongs to is determined at game start, and only bones in that pool
are used. The sysconf BONES_POOLS allows the sysadmin to define how
many pools there are.
SYSCF is enabled by default, but nethack won't run without the required
sysconf file. sys/vms/install.com expects to find a template one in
sys/vms/sysconf so create that.
Since the tarball will need repackaging, fix a comment typo (dyslexic
spelling of "nymph") in sys/unix/sysconf. Also, move DEBUGFILES to the
bottom so that more useful entries move up. And expand the comment for
the PANICTRACE options.
