Add recordfile control to SYSCF.

Add sys/unix/sysconf, a sample sysconf file.
Move defines from topten.c to config.h so they can be seen globally.
Add persmax, pers_is_uid, entrymax, and pointsmin to struct sysopt, use
 in topten.c, populate in files.c
Warning cleanup in files.c.
BUGFIX: don't crash in unixmain.c if WIZARDS left unspecified.
hints/macosx10.5: don't hardcode "keni"; install sample sysconf; install
 sample ~/nethackrc
makedefs: add "system configuration" to compiled-with options list.
BUGFIX: if a game doesn't meet the criteria for making the record file it's
 shown to the user as having zero points because t1->points is set to zero
 to indicate that it doesn't get written back; display u.urexp instead.

sys/unix/sysconf

@@ -0,0 +1,37 @@
+#
+# NetHack 3.5 sysconf $Date$ $Revision$
+#
+# Sample sysconf file.
+# The sysconf file is only used if NetHack is compiled with SYSCF defined.
+# This file uses the same syntax as nethack.cf.
+
+# Which users can use WIZARD (debugging) mode (the -D flag).
+# A value of * allows anyone to enter debugging mode.
+WIZARDS=root,games
+
+# Users allowed to use the ! (shell escape) command.  Uses the same syntax
+# as the WIZARDS option above.
+#SHELLERS=
+
+# Limit the number of simultaneous games (see also and nethack.sh).
+MAXPLAYERS=10
+
+# If not null, added to string "To get local support, " in the support
+# information help.
+#SUPPORT=call Izchak at extension 42.
+
+# If not null, displayed at the end of a panic-save sequence.
+#RECOVER=Run the recover program.
+
+# Record (high score) file options.
+# CAUTION: changing these after people have started playing games can
+#  lead to lost high scores!
+# Maximum entries for one persion.
+#PERSMAX=10
+# Maximum entries in the record file.
+#ENTRYMAX=100
+# Minimum points to get an entry.
+#POINTSMIN=1
+# Determine identity of "person" in the score file with name (0) or
+# numeric (1) user id.
+#PERS_IS_UID=1