Added pln unit tests for andlink rules
Corrected andlink inside link rules
Modified and inside link examples

Unit tests pass now
Fixed subset evaluation rule unit test
Set parameters to default
Merge pull request #969 from sebastianruder/unit_test_fix

Fixed subset evaluation rule unit test
Merge pull request #970 from sebastianruder/context

Created PLN unit test rules for newly created AndLink rules
Add user option to output deme ID