TurtleParser.hs: lots of changes and additions; still many failures with regard to conformance tests.
TurtleParser.hs: lots of changes and additions; still many failures with regard to conformance tests.

darcs-hash:20071017014241-db1bb-55c6bc0e75d6f0878b164c3c09959ba35b4fa4e9

cordawyn/rdf4h,LeifW/rdf4h,ddssff/rdf4h,jutaro/rdf4h