Added manifest_world object to hold shared uris and literals
Move all test graph reading to manifest_new_test()
Fix null test type test
Added dawgt: namespace and dawgt:approval URI and literal
Decode test approval and withdrawn state
Add checks for entailmentRegime
Remove unused ent:entailmentRegime and namespace ent:
Add support for qt:query for test query URI

Also rename tq_ to qt_ to match turtle usage