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

sys/unix/Makefile.top

@@ -38,7 +38,7 @@ DIRPERM  = 0755
 # instructions)
 #HACKDIR  = $(PREFIX)/games/lib/$(GAME)dir
 VARDIR  = $(HACKDIR)
-SHELLDIR = $(PREFIX)/games
+#SHELLDIR = $(PREFIX)/games
 
 # per discussion in Install.X11 and Install.Qt
 #VARDATND = 
@@ -245,7 +245,7 @@ install: rootcheck $(GAME) recover $(VARDAT) dungeon spec_levs
 	-mkdir -p $(SHELLDIR)
 	-rm -rf $(HACKDIR) $(VARDIR)
 	-mkdir -p $(HACKDIR) $(VARDIR) $(VARDIR)/save
-	-rmdir ./-p
+	if test -d ./-p; then rmdir ./-p; fi
 	-$(CHOWN) $(GAMEUID) $(HACKDIR) $(VARDIR) $(VARDIR)/save
 	$(CHGRP) $(GAMEGRP) $(HACKDIR) $(VARDIR) $(VARDIR)/save
 # order counts here: