begin work on a new feature selection unit test

Using a bag-of-words constructed from real data from a web newsfeed.
Enable the new test.
new test switched over to single-threaded
tests should clean up after themselves.

They keep leaving grunge in the  /tmp directory.  Annoying.
remove junk files left behind by test.
Merge pull request #173 from linas/moses

Moses dynamic feat-selection UTest
Resolving #172
Merge pull request #174 from rekino/master

A fix for bug #172
Patch the new test, try to get it to pass...
Merge pull request #175 from linas/moses

Patch the new test, try to get it to pass...
restore determinism to feature selection.

See comments at
https://github.com/opencog/opencog/commit/f92d21917b7dbce6a627494950031b99d8d13386
for details.
temporary hack til other things get fixed ...
randomized sort order function
find a better mixining function for randimization.
bug fix in new compare code!

When using greter, the sort order is reversed. Dohh! That explains
the mixing problem I seemed to be having...
remove comments about mixing.
clean up notes in the new code.
patch up the unit test tow work.
Merge pull request #176 from linas/moses

Moses -- deterministic feature selection fix
clarify source of log message.

Having one print not two increases performance, too.