PANICTRACE (stacktrace on panic or signal) + bits

On crash signal or panic(), use a configurable method to get a stacktrace
the user can easily report to us.  Currently only for Unix/Linux and only
ifdef BETA.  Hopefully ports can add additional methods.

Bits:
- linux hints file had PREFIX definition in the wrong place
- sample sysconf file used wrong delimiter for WIZARDS
- fix grammar error in support message when using sysconf.wizards
- options.c comment typo
- capitalize "Crash test" output from #panic command

include/sys.h

@@ -1,5 +1,4 @@
 /* NetHack 3.5	sys.h	$Date$  $Revision$ */
-/*    SCCS Id: @(#)sys.h      3.5     2008/01/30      */
 /* Copyright (c) Kenneth Lorber, Kensington, Maryland, 2008. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -21,6 +20,14 @@ struct sysopt {
 	int pers_is_uid;
 	int entrymax;
 	int pointsmin;
+#ifdef PANICTRACE
+		/* panic options */
+	char *gdbpath;
+	int  panictrace_gdb;
+# ifdef PANICTRACE_GLIBC
+	int panictrace_glibc;
+# endif
+#endif
 };
 E struct sysopt sysopt;