C::M::AnyThing: added has_warning fallback method (always return 0)
test instance->has_warning with big_model
C::M::Anything: added clear_annotation method
test clear_annotation
v2.049

    Bug fix and minor new feature release:
    * C::M::AnyThing: added has_warning fallback method (always return 0)
	  (RT 93329)
    * C::M::Anything: added clear_annotation method