Replace Boosting with cell death (energy)

[breznak]

As a part of #287 I mention

replacing boosting with cell death

this is done in 2 steps:

• cells (or segments) have a concept of energy (when used/activated, you get new food)
• cells without energy die , are removed. This might help TP, BacktrackingTM execution times depends on (SP's) input size, and should not #267
• a mechanism spawns new cells
  • when? randomly, to keep constant number of cells, ...?
  • where? random input space, where noone is, where hotspots are..?

[breznak]

https://discourse.numenta.org/t/replace-columnar-boosting-with-energy-cell-death/5537