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/decl.h

@@ -1,5 +1,4 @@
 /* NetHack 3.5	decl.h	$Date$  $Revision$ */
-/*	SCCS Id: @(#)decl.h	3.5	2008/07/20	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -390,6 +389,10 @@ struct autopickup_exception {
 };
 #endif /* AUTOPICKUP_EXCEPTIONS */
 
+#ifdef PANICTRACE
+E char *ARGV0;
+#endif
+
 #undef E
 
 #endif /* DECL_H */