Ride Plot Refresh Bug

.. when compare switched off when not visible we need to
   refresh when we become visible
Fix Compare Histogram Zone labels

.. don't show when not checked for compare
Strava: correct Strava OAuth process
Export LTM Chart Data Option

.. forgot to commit before RC1
PfPv Plot Quadrant Markers Colors

.. when in compare mode
First Draft of Content for New 3.1 Website

.. outlining the basic science in GoldenCheetah
SrmRideFile: don't assert() on bad file version

replaced assert() of file version with graceful error handling.
SrmRideFile: handle EOF while reading chunks

code was blindly trusting datacnt... and kept reading past EOF. That's bad
as datacnt occasionally isn't matching the available data (overflow,
corruption, ...)
SrmRideFile: handle datacnt overflow

datacnt is 16bits so it overflows easily for large files (9 hours with
0.5sec recint).

I've also seen datacnt and block sum to be inconsistent in other cases.

To handle this more graceful, we're now taking the max of both counts and
let the EOF detection do it's job when one of them is wrong.

We do have to use one of these limits as some SRM files have junk after
their last chunk (so, just reading chunks till we get EOF retunrs this
junk, too).
Merge pull request #964 from rclasen/srm-overflow

SrmRideFile fixes
Add Support for PWX "title" field

.. it is read/written to metadata field called
   "Workout Title"
GProgressDialog Move and no ESC to close !

.. we can now drag and move the GProgressDialog around

.. if user hits ESC we trap and ignore it (otherwise it would
   triggers a close event that causes a crash)
GC Science Docs

.. fix grammar, spelling and style
merge upstream into master