o Only probe for key press on bootup.

o Rebuild autodetect feature: fixup second use case of
  get_interface_list() to filter out devices without a
  good link state, bring back interface up for it to
  work and mute kernel messages that would clobber stty
  behaviour.

While there, clean up messages for clarity and grammatical correctness.

Had to merge and squash and edit punctuation:

" :" to ":", " ?" to "?" to retain original document style