Plot Model Estimates on LTM

.. as well as W', CP etc we now support plotting any
   duration model estimate.
Ride list colour subtly

.. if you have user defined colors for the ride list but don't
   choose to set as background (ITS UGLY!) then we put an accent
   bar on the rhs .. which looks much nicer.

.. I guess its a matter of taste .. some don't have any ;)
If W' is configured in KJ convert to Joules

.. if user enters W' < 1000 then multiply it up
.. if old config remains with W' < 1000 multiply it up
Ride list accent bar on Mac Qt<5 or Non-Mac

.. the code needed to account for scrollbars on Macs running
   Qt < 5 and on all other OSes.
Merge remote-tracking branch 'upstream/master'