Add MAXPLAYERS to SYSCF config file; deprecate (but continue to support)
MAX_NR_OF_PLAYERS in nethack.sh since it is trivially overridden in many
(all?) cases and isn't useful for ports that don't use nethack.sh.
infrastructure for "system options" - things currently specified at build
time that should be changeable at install time or run time but not really
under user control
generalize contact info so it can be localized and it doesn't have to be
an email address
move recently introduced WIZARDS into sysopt
drop bogus OPTIONS=wizards possibility
new function build_english_list() to comma-ize and add 'or' from a whitespace separated list: A. A or B. A, B, or C.
syscf file now handles: WIZARDS SUPPORT RECOVER
SUPPORT specifies local support information
RECOVER will eventually supply port-specific and/or localized info on how
to run recover (or get it run for you).
Note: in sys/msdos I changed sys.o (generated from pcsys.c) to pcsys.o
Note: sys/msdos/Makefile.GCC has 2 rules for sys.o (now pcsys.o)
