UI Nits: Less is more

.. remove grid line from CP plot.
Remove References in Dialog

.. you can now choose to remove reference lines in the
   allplot when you double click on the axis.

.. we might want to put the table and buttons for deleting
   references into the chart settings too (?)
Find Ascents

.. another method for find intervals to find the ascents
   in a ride. Uses the hysteresis as defined in options
   which means a climb ends if there is a descent of that
   or more (by default only 3m).
Clear results when switch type

.. to W' bal or Ascent type interval searching