[DROOLS-64] Traits do not comply with type inheritance on modify
[DROOLS-94] fix BaseObjectClassFieldReader when reading numeric values
[DROOLS-64] fix not isA evaluator
[DROOLS-92] add test case to check that fields are rewired correctly when dynamically adding/removing rules
[DROOLS-93] fix error reporting when using a wrong field name with @declaration
[DROOLS-93] fix declared types namespace