SHELLERS for SYSCF, MacOS 10.5 hints file (trunk only)

Add SHELLERS - people allowed to use ! command with same syntax as WIZARDS.
Add new hints file for 10.5, since the rules and commands for groups changed
(new commands introduced in 10.4, old ones removed in 10.5; creating a new
user under 10.4 gave you a matching group, in 10.5 it doesn't).  Also move
shared build into roughly right place in file system when being installed
for root - don't use ~root.
Makefile.top - don't remove ./-p unless it exists (that's always annoyed me).
fix error invoking macosx.sh

include/config.h

@@ -150,10 +150,11 @@
  *		If SYSCF is defined, the following configuration info is
  *		available in a global config space, with the compiled-in
  *		entries as defaults:
- *		WIZARD		( a value of * allows anyone to be wizard)
+ *		WIZARDS		( a value of * allows anyone to be wizard)
  *		MAXPLAYERS	(see MAX_NR_OF_PLAYERS above and nethack.sh)
  *		SUPPORT		(how to get local support)(no default)
  *		RECOVER		(how to recover a game at your site)(no default)
+ *		SHELLERS	(who can use !, syntax as WIZARDS)
  *
  *		The following options select how the config space is stored:
  *		SYSCF_FILE	in the named file

include/extern.h

@@ -2322,6 +2322,7 @@ E void NDECL(port_help);
 # endif
 E void FDECL(sethanguphandler, (void (*)(int)));
 E boolean NDECL(authorize_wizard_mode);
+E boolean FDECL(check_user_string, (char *));
 #endif /* UNIX */
 
 /* ### unixtty.c ### */

include/sys.h

@@ -13,6 +13,7 @@ struct sysopt {
 	char *support;	/* local support contact */
 	char *recover;	/* how to run recover - may be overridden by win port */
 	char *wizards;
+	char *shellers;	/* like wizards, for ! command (-DSHELL) */
 	int   maxplayers;
 };
 E struct sysopt sysopt;

include/unixconf.h

@@ -279,7 +279,9 @@
 #endif
 #define tgetch getchar
 
-#define SHELL		/* do not delete the '!' command */
+#ifndef NOSHELL
+# define SHELL		/* do not delete the '!' command */
+#endif
 
 #include "system.h"