Remove Column Chooser from Chart Settings

Because the chart settings are modal its a really bad
idea to open up a column chooser from there. So, by
default, we don't have a column chooser option on the
search/filter box -- it must be explicitly requested.

We therefore explicity set the column chooser from the
mainwindow and also from the ride navigator window.
Merge pull request #630 from amtriathlon/master

Last update to spanish translation
New LTM Chart Setup Mockups

.. to support measures, metrics, bests and user defined
   (formula). For v3.1 development.
Minor website update.
Version 3 Release

.. update of build and upgrade processing for
   release 3 final update.
Website updates for Version 3.0
Merge branch 'master' of github.com:GoldenCheetah/GoldenCheetah