Based on the the XV11R2 Xaw Label widget, with the following major changes...

1) Not a subclass of "Simple".  That seems backwards to me - "simple" should be
   a subclass of "label", since there is a need for unadorned text, text that
   is displayed the same no matter what context it is in.

2) Has a "QueryGeometry" function that okays getting bigger, but nixes
   getting smaller than it is supposed to be.

3) Allows text with embedded newlines and has a justification resource.

4) Has its own gravity resource, so that it can be set with XtSetValues, and
   and used without worrying if the server will get it right.

5) Reacts appropriately to XtGeometryAlmost replies. Label doesn't.

