Small changes to context rules
Added truth values to context examples

So examples are going to be recognized by PLN
Created ContextAgent and example to run it

Using examples originally used for pattern matcher verification
Added deleted outputs
Created contextFormula
Applied small fix
Added condition for ContextToSubsetRule
Limited line length to 80 characters
Added doc strings, explanation links
Fix up the been-visited member
Start work on the ensemble concept.
shuffle around contents of metapop.h
start roughing in a path to the boosting set
Merge pull request #864 from linas/dmos

MOSES: Minor code shuffling; start ensemble
Pattern match: misc minor extnsions, documentation
pattern matcH: move utility code to utility file
pattern matcher: remove bogus atomspace dependence
Begin work on the greater-than link, in earnest
more work on greater-than links
Implement the recursion for combinatoric explosion