moses: clarify documentatino for scorer

Clarify how precision/recall works.  There are bugs here, see next commit.
moses: Bug fix for the recall-maximizing scorer.
moses: fix the recall scorer and framework

The previous "generic" scoring framework was insane, and generated
incorrect results.  This fixes some serious deficiencies with the
earlier design.  I think that the recall scorer now works more or
less correctly. The other scorers (prerec, f_one, and bep) may be
broken in the new design, and need a careful review.
Merge pull request #70 from keyvan-m-sadeghi/master

Added my name to the list of authors
Added parameter grounding (50% fininshed) .
And some indexes for speed up the planning process.
Merge branch 'master' of https://github.com/opencog/opencog into shujing
Merge pull request #71 from shujingke/shujing

Shujing
moses: fix divide-by-zero in recall scorer

Sadly, NaN's can occur with real data.
moses: user-specified max score always over-rides

The scorer can provide an inferred max score. Don't use it if the
user provided an explicit max value.
moses: validate the pre-rec scorer
Merge github.com:/opencog/opencog into moses
Merge pull request #72 from linas/moses

Moses merge recall scorer fixes
moses: (minor) its an estimate not an exact result
rename feature_optimization.h to incremental.h

Reanme it because it contains the cod for the incremental algo.
The optimization algo is in a different place.
Fork the main/feature-selection.h file

The deme optimizer stuff gets its own header file.
moses: Add missing header file.

Curiously, this file was previously included via the feature-selection
header files. When these got re-arranged, optim_stats became undefined.
moses: add another missing header file.

The absence of this header file appear when the feature-selection
headers got restructured!
factor out the deme-based feature selection

Put the deme-based aka "hill-climbing" feature selection code
into its own header file, rather than having it in the main one.
feature-sel: move algo files to own directory
feature-selection: whoops, header changes

... broke this test.  Fix it.