generics: one fix to ensure the class we output says 'class X implement I' rather...

generics: one fix to ensure the class we output says 'class X implement I' rather than 'class X implements I<String>' when the I<String> is added via declare parents.  (I<String> should be captured in the signature attribute on the class X).  Also some placeholder code added (commented out) that we'll need when trying to fix up the signature attribute when binary weaving.