Fix gcc compile time warnings

.. in preparation for 3.1 release
.. but still need to fixup for Mac clang too
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.
Fix CP heat age cosmetic glitch
Enable Translation (1)

... enable translation

(cherry picked from commit d4deb2fd981d601a1378172e24a20b61a7b3c4ec)
Merge pull request #875 from Joern-R/pull

Enable Translation
Accent sidebar on ridelist right height

.. needs to account for font metrics and not just default
   to 50 high. Only notice this if the user has larger fonts
   which can be common on high DPI screens.
Recompute Metrics on W' change

.. and also fix CRC code that stops recompute if the ride file
   hasn't changed since it may be recomputed for other reasons !
Add recent contributors

.. Dr Phil Skiba for TISS etc
.. Michael Puchowicz for the Veloclinic PD Model
.. Jörn Rischmüller for supporting German translation
Extend Theme color coverage

.. to include power, cadence etc

.. this is particularly relevant for colors that need to change
   if we have a light background (e.g. power in yellow on white
   is almost impossible to see for some people)
Added Schoberer Color Scheme

.. mimic colors used by SRMWin and the scheme is named after
   the founder of SRM Ulrich Schoberer
Tweak Alt default to light gray
Add Overlay to AllPlot

.. show interval details when hovering over them on the ride
   plot using the new overlay widget
Be consistent - 'Overlay' not 'Show Overlay'
merge upstream into master