* added failing test cases for wrong behavior of LogicProgram::accept() wrt externals
* added failing test cases for wrong behavior of LogicProgram::accept() wrt externals

git-svn-id: dfe9b10be7d61426bcc8664159a3aac00ca7549b@53284 adcd87e9-38e8-0310-969d-ff0ec0a098a6

potassco/clasp,potassco/clasp