Code corrections/cleanup
Minor comment correction
Calculate tau for W'

The implementation set tau to a constant when it
should be derived from the recovery power across
the ride.

I've also added tau to the chart so you can see
what value has been derived.
Fix W' calculator for bad data

Fix 1s smoothing to ensure time doesn't go backwards
as when the same timestamp is used more than once the
QwtSpline used to interpolate returns all zeroes.
merge master into personal
Get rid of qwt compile error about format string.

Author: KURASHIKI Satoru <lurdan@gmail.com>

Taken from Debian patches for GC 3.0.3
merge master into personal
Merge pull request #712 from gcoco/master

ShareDialog corrections
merge master into personal
ShareDialog: Strava authorise was broken in last commit
merge master into personal
Allow user to specify W' alongside CP

In preferences->athlete->power you can now set
your W' in joules alongside your CP.

This is also available in the new cyclist dialog
which also defaults to 20Kj.
merge master into personal
Adjust layout in Preferences

As new W' setting in athete -> power is all
squashed up on a Mac (where spacing is defaulted
to 20, not 10).
W' calculator fill gaps with zeroes

Otherwise they are interpolated and smoothed, which is not
consistent with the rest of GC.
merge master into personal
Website updates
Run: lupdate-qt4 src/src.pro

Update the translation source files
Add NP and xPower Derived Data Series

Calculate NP and xPower as a data series so we can
plot on the ride plot.

Have also added 'aPower' which will be coming in the
next few days - altitude adjusted power, which will also
have some associated metrics (a-xPower, a-NP, a-TSS etc).
Add aPower

Introduce altitude adjusted power 'aPower'.

This is a new ride data series that takes into account
the effect of altitude on power output.

At present we are only adding this as a derived data series
with the intention of making it possible to plot it on
the ride chart.

We will also introduce alternate metrics for average power,
bikescore etc that are based upon the aPower value.