Add signals for entering or exiting the AttentionalFocus
Add HebbianCreationModule to create AsymmetricHebbianLinks between atoms in the AttentionalFocus
Multi-threaded AsymmetricHebbianLink creation
Remove deprecated Python HebbianMining code
Add unit test for HebbianLinkCreationModule
Update comments
Add unit tests for AddAFSignal and RemoveAFSignal in AtomSpace
Update HebbianCreationModule
Update initial TruthValue Count of AsymmetricHebbianLinks to 1. Update documentation.
Add HebbianCreationModule to config file, disabled by default
Merge pull request #549 from cosmoharrigan/AttentionAllocation

Hebbian link creation for Attention Allocation, new signals for Attentional Focus