New attribute - notouch - added to simple_link

A data-notouch='true' on a link => link does not touch / change the
present view in any way. The pane contents stay as they are

You can think of this as a shorthand for
  left : as-is
  middle : as-is
  right : as-is
  wide : as-is
Re-named update_workset to receive_scans. More obvious
lnk-wb-receive behaviour defined
Removing old code for firing receive scans