make MPWRect's components available, faster MPWValueAccessor, number formatting
bugfix:  "collect" HOM was failing with <null selector> on
         empty arrays with some messages (stringValue)
         cause:  ignore-trampoline was falling afoul of an
          optimization in its superclass, MPWTrampoline, which
          was resolving zero-arg messages with a custom method
         fix:  resolve *all* messages in the ignore-trampoline
               with a method that returns the target (same as
               the forwardInvocation: method does), not only
               fixes the problem but makes it go a lot quicker