[ANN] XmlSchema 1.4.7 released

Apologies to general; I constantly forget about the 'cc' implications
of the subproject structure.

The vote to release 1.4.7 passed with 3 binding +1's, one non-binding
+1, and the John Cage chorus of other voices.

I've pushed the new release, it will of course take some time to
replicate around.