[mlview-list] Latest patches...

[Philippe Mechaï <pmechai free fr>]

Hi list,

Took some time to put some more time in MlView those days :)
Changes are:
* MlViewValidationWindow got some HIG love...
* ...MlViewSchemas window too.
* MlViewNodeEditor is Glade powered.
* Changed tree view layout (see Bug #150932) but still need to fix some
little bugs. 
* A couple of fixes here and there...

Everything is in my archive.

Regards,
Philippe