Estimated vo2max should be a peak

.. Fixes #988
Histogram - parameter changes

... changes in some of the parameter do not take immediate effect on
change, some do - adjusted to unique handling of config. changes
Merge pull request #989 from Joern-R/pull2

Histogram - parameter changes
REMOVE OAUTH DEBUG
Honour MapQuest terms of service

.. with an attribution and link to the MapQuest website.

.. the terms of service, for free usage, are detailed
   here: http://developer.mapquest.com/web/products/open/elevation-service
Fatal Dialog not QDebug

.. if we cannot start due to permissions / create library folder
   we now output a dialog rather than a qDebug -- this is better
   for Windows or those that start from a menu etc
Version 3.1 RELEASE CANDIDATE 3

.. updated version number
Refresh Series Stack when ByDistance changes

.. Fixes #990
Defer "Fix Elevation" tool to 3.2

.. pulling out of v3.1 due to problems better fixed outside
   of the release window
RELEASE CANDIDATE 3X

.. re-issue of RC3 without Fix Elevation
Merge remote-tracking branch 'upstream/master'