o Move one more global variable in its object.
o document the use of the global background image.
o formulate help levels in terms of levels reached. That way the
  places that reach a level don't need to know what the 'next' level
  is.
o add another help level: showing angles.
o show longer T-line for the current editline.
o move cursor to 'icons/'
o extend cross-hair cursor a bit.