--help / --help-defines: dce and -D improvemnts

- dce docs now mention the default value
- the docs on --help and --helpDefines for dce are now consistent
- it's now clearer that -D var=value is valid

common.ml

@@ -256,7 +256,7 @@ module Define = struct
 		| CoreApi -> ("core_api","Defined in the core api context")
 		| CoreApiSerialize -> ("core_api_serialize","Mark some generated core api classes with the Serializable attribute on C#")
 		| Cppia -> ("cppia", "Generate experimental cpp instruction assembly")
-		| Dce -> ("dce","<mode:full|std|no> The current DCE mode")
+		| Dce -> ("dce","<mode:std|full||no> Set the dead code elimination mode (default std)")
 		| DceDebug -> ("dce_debug","Show DCE log")
 		| Debug -> ("debug","Activated when compiling with -debug")
 		| Display -> ("display","Activated during completion")

main.ml

@@ -1097,7 +1097,7 @@ try
 				| _ -> 	if List.mem var reserved_flags then raise (Arg.Bad (var ^ " is a reserved compiler flag and cannot be defined from command line"));
 			end;
 			Common.raw_define com var;
-		),"<var> : define a conditional compilation flag");
+		),"<var[=value]> : define a conditional compilation flag");
 		("-v",Arg.Unit (fun () ->
 			com.verbose <- true
 		),": turn on verbose mode");
@@ -1112,7 +1112,7 @@ try
 			| "std" | "full" | "no" -> ()
 			| _ -> raise (Arg.Bad "Invalid DCE mode, expected std | full | no"));
 			Common.define_value com Define.Dce mode
-		),"[std|full|no] : set the dead code elimination mode");
+		),"[std|full|no] : set the dead code elimination mode (default std)");
 		("-swf-version",Arg.Float (fun v ->
 			if not !swf_version || com.flash_version < v then com.flash_version <- v;
 			swf_version := true;