Store frequency + other attributes in patterns of the pattern miner

[ngeiswei]

Currently the new pattern miner does not keep any intermediary information leading to its discovery such as its frequency, eventually its surprisingness. This should be kept track of, either by attaching Values to the atom corresponding to the pattern, or explicitly via EvaluationLink in the atomspace.

[linas]

I recommend using CountTruthValue for counting things. There's some existing infrastructure (e.g. the matrix code) for converting counts into a large variety of other things (marginals, conditionals, totals, frequencies, entropies, MI, etc.)

[ngeiswei]

This has been addressed in various PRs, closing.