nlp pipeline bugfix.

Work around some stupid relex error of some kind.
Misc benchmark updates
status update
Specify Python version 2.x, 2.7 or greater, for #88
Merge pull request #518 from cosmoharrigan/python-version

Specify Python version 2.x, 2.7 or greater, for #88
Remove unused uci_adult_dataset as confirmed by @keyvan-m-sadeghi in https://github.com/opencog/opencog/commit/0447e31a09525795cd3b3820d0fe9f535e86a03e#commitcomment-5063676
Merge pull request #519 from cosmoharrigan/python

Remove unused uci_adult_dataset as confirmed by @keyvan-m-sadeghi in:
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
Remove VersionHandle API from AtomSpace
Remove VersionHandle from AtomTable
Remove VersionHandles from unit tests
Version Handle removal: get tests to pass
Remove the CompositeTruthValue utest
Remove version handles from scheme bindings
remove CompositeTV from file persistance
Remove CompositeTruthValue