Add AndToSubsetRule
Add AndToSubsetRule to the chainers
Add NegatedAndBulkEvaluationRule
Test and fix NegatedAndBulkEvaluationRule
A clarification on rule.py
Add PreciseModusPonens
Allow test files with more than one query
Merge opencog/opencog
Merge pull request #679 from jadeoneill/master

Some rules to directly evaluate ImplicationLinks based on a dataset
Fix PAI::createActionPlan() when concept node plan_selected_demand_goal not exist

It made the assumption that a concept node plan_selected_demand_goal
exit, this is apprently created by OpenPsi. PAI should not have that
kind of depence on OpenPsi, ultimately that logging code should be
moved out of that method.
Remove comment about OpenPsi PAI dependence as ActionPlan takes a demand in argument
Some minor PET -> AVATAR fix