TMRegion: allow output as columns, not only cells

[breznak]

• use logic from TMRegion.orColumnOutputs
  • rename the variable to asColumns
• for all of activeCells, predictiveCells (in TMRegion: also output predictiveCells #412 ), winnerCells allow to output as columns, if this is set
  • use TM.cellsToColumns() for that, from TM: cellsToColumns  #397
  • add test, as currently untested
• decide what TMRegion "bottomUpOutput" should return,
  • but definitely not active+(union)predictive cols/cells.

Follow up to #397