Added virtual power support for Tacx Blue Twist trainer
Added virtual power support for Tacx Blue Motion trainer
added Tacx Blue Twist and Tacx Blue Motion to Device Wizard
Fix sidebar resiziung bug

.. caused by CP plot.

.. have no idea /why/ this occurs, but fixed by commenting
   out the div scale for the CP plot (that isn't needed anyway)
CompareInterval ridefilecache

When an interval is added to the compare pane we now
compute the RideFileCache so it can be re-used in the
Histogram and CP charts without computing it each time.
Refactor arrays out of PowerHist class

.. in preparation for updating for compare mode.
Histogram Window Interval Compare Mode

.. still needs tidying up for some combinations of show/hide
   tab switch and adjusting chart parameters but is 99% there

.. still need to apply the same compare update for when comparing
   seasons not intervals
Histogram Compare Axis Scaling Fixup

.. truncate the x-axis for small values

.. only set y-axis max for selected intervals
Histogram Compare Fixup

.. remember we can plot for a season and recognise that
   when checking for isCompareIntervals in PowerHist.

.. fixes a SEGV when looking at a histogram in the trends
   view whilst compare intervals is active in ride view.
Compare Pane Don't Add Metrics already there

.. distance and duration are default metrics on the
   summary, so we need to make sure we don't double
   up on the compare pane.
Compare RideFileCache Optimisation

.. need to only create when needed and also need to
   delete when done.
Golden Ratio for Grouped Bars

.. on the histogram charts when comparing multiple
   intervals we group using a golden ratio to make
   it easier to read.

.. this is less about the histogram and more about
   establishing the aesthetic in time for the LTM
   updates for compare date ranges.
HistogramWindow remove legend

.. for now, it causes a nasty refresh glitch.
Fixup compare interval refresh

.. usual signals and refresh optimization and
   bugs (switch tabs + switch compare mode).
Fixup Histogram Compare Zones

.. it was using the range from rideitem
Merge pull request #737 from Tafkas/master

Add virtual power support for Tacx Blue Twist and Blue Motion trainers
Merge branch 'master' of github.com:/GoldenCheetah/GoldenCheetah
Histogram Compare Date Ranges

.. for bests, not metrics on Histogram

Still need to fixup Histogram to plot metrics
in compare mode for date ranges.
Disable Metric Histogram Compare

.. to avoid errors until we implement
   histogram metric compare date range
Histogram Compare Metric

.. the last of the histogram updates to compare date ranges
   for distribution by metric (e.g. IF for rides)