[redland] Query language support in Redland

[Dave Beckett]

Just a quick note to say I've started added the infrastructure for
this to Redland and now have a working dumb triples-matching query
language coded, to test it out.

I can't promise that it'll get a real QL any time soon, since that
will be a lot slower to code - mostly to in converting the existing
QLs from Java and debugging.  Plus I have to pick one (1) to work on
from RDFDB QL, Squish QL, RQL, RDQL, Versa, etc. etc.

Dave