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

src/pager.c

@@ -1,5 +1,4 @@
 /* NetHack 3.5	pager.c	$Date$  $Revision$ */
-/*	SCCS Id: @(#)pager.c	3.5	2009/01/30	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -897,7 +896,7 @@ docontact()
 		putstr(cwin, 0, "");
 	} else if(sysopt.wizards){
 		char *tmp = build_english_list(sysopt.wizards);
-		Sprintf(buf, "To contact local support, %s", tmp);
+		Sprintf(buf, "To contact local support, contact %s.", tmp);
 		free(tmp);
 		putstr(cwin, 0, buf);
 		putstr(cwin, 0, "");