cs_entrymsg: Check for the correct override privilege.

Make some more commands check if Read-Only mode is active.
cs_flags: Show a meaningful message when a user is not found on the access list.
os_set: Add missing capabilities to the readonly help output.
OperServ: Add logging to certain commands.
NickServ: Undo logging for listings.

modules/commands/cs_flags.cpp

@@ -222,7 +222,7 @@ class CommandCSFlags : public Command
 			}
 			else
 			{
-				source.Reply(_("Insufficient flags given."));
+				source.Reply(_("\002%s\002 not found on %s access list."), mask.c_str(), ci->name.c_str());
 			}
 			return;
 		}