failing test for nblasting neurons

* turns out that UseAlpha makes it through
refactor WeightedNNetc to fix neuron comparison

* Idea was to ensure that we use appropriate defaults for each type
Merge branch 'fix/nblast-neurons'

* fix/nblast-neurons:
  refactor WeightedNNetc to fix neuron comparison
  failing test for nblasting neurons
fix: nblast_allbyall should always return a matrix

* even when there is only 1 neuron
* also no need to go through sub_score_mat for raw scores