BUG: Don't use thinned version of channel network
BUG: Don't use thinned version of channel network

* Using the thinned version violates the flow direction map and can
  result in channel cells, which do not connect to another channel
  cell in the downstream direction. The thinned channel raster is only
  for conversion to vector as a visualization tool.

sahg/PyTOPKAPI,scottza/PyTOPKAPI