kernel - Store page statistics in bytes

kernel - Store page statistics in bytes

* Store page statistics in bytes rather than pages.  Pages aren't useful
  for userland display and there is no reason to force useland to do the
  conversion.

* Include a realtime timestamp along with ticks in the structure.

* Flesh out text output for kcollect.  Reverse output order to print
  oldest data first, so output from the -f option stays consistent.