nlp pipeline bugfix.

Work around some stupid relex error of some kind.
Misc benchmark updates
status update
start simplifying some of teh scheme utilities.
more scheme utilities simplification
more scheme utilities cleanup
more scheme utilities simplification
Provide multi-threaded version of utilities
Revert recent multi-thread code
Merge github.com:/opencog/opencog into learn
Add missing include for ubigrapher
Merge pull request #521 from linas/learn

Miscellaneous work, mostly on multi-threaded scheme