TCs updated

Hi all

I've refined some TCs thanks to Juan suggestions.
The repos [1] and document [2] are updated.

I'll continue working on them this week, and If I have time start working with the TH software

Boris

[1] http://dvcs.w3.org/hg/rdb2rdf-tests
[2] http://www.w3.org/2001/sw/rdb2rdf/test-cases/