… ywcui1990-boostingRes

For permanances, use an EPSILON.

For boosting, round the boost factor to a couple decimal
places. Floating point differences have a larger effect on boosting
because it's multiplicative.

Avoid floating point differences with C++ SpatialPooler

It's proving to be too difficult. So our options are:

1. Use shared C code to calculate boost factors and duty cycles
   for Python and C++ SpatialPoolers
2. Don't try to make them equal. Change the compatibility test to
   make sure the boost factor is right "enough", and then force them
   to be exactly equal, similar to what we already do with
   permanences.

This change takes the second approach, which I think is the better
approach.

Rather than using a mathy heuristic with an "arbitration" constant,
explicitly handle the tie-break case.

This mirrors a change in the C++ code. It's needed for compatibility.

Stop trying to get identical boost factors between py and cpp

…ding rules in boosting