Use GroundedPredicateNode
PM: virtual links key on GroundedPredicateNode
virtual links are no longer reatert-than links
Get rid of GreaterthanLink
Get rid of GreaterThanLink
Handle the virtual links via callback
Add a bit more documentation.
Merge pull request #867 from linas/gt2

Rename GreaterThanLink to EvaluationLink
Removed bracket which led to an error in the cogserver
Merge pull request #868 from sebastianruder/small-fix

Removed bracket which led to an error in the cogserver
Clarify documentation