[haXe] minor issues with -as3

[Nicolas Cannasse]

> The 1st issue is that "override" is not being copied/transferred to the
> .as file.
> The following program compiles correctly with the settings:

This have been patched on haXe CVS.

> The 2nd issue can be seen in this error message which was generated by
> Flex:
> 
> C:\Program Files\Adobe\Flex Builder 2\Flex SDK 2\bin>mxmlc
> C:\haxe\test\__main__.as
> Loading configuration file C:\Program Files\Adobe\Flex Builder 2\Flex
> SDK 2\frameworks\flex-config.xml
> C:\haxe\test\Test4.as(19): col: 51 Error: Incompatible default value of
> type Null where Boolean is expected.
> 
>                 static public function myFunct2(yyy : Boolean = null) :
> String {
>                                                                 ^
> 
> -------------- original file: Test4.hx --------------
> 
> class Test4 {
> 
>     static function main() {
>         new Test4 ();
>         trace("** " + myFunct1(true));
>         trace("** " + myFunct2());
>     }
>     
>     public function new() {
>     }   
> 
>     public static function myFunct1 (xxx:Bool) : String {
>         return "myFunct1";
>     }
> 
>     public static function myFunct2 (?yyy:Bool) : String {
>         return "myFunct2";
>     }
> }

Yes, as explained here : http://haxe.org/tutos/as3_gen , you need to use
Null<Bool> (or Null<Int> and Null<Float>) for optional arguments.

Nicolas