The left side of MainWindow is now a toolbox which contains
Ride Analysis and Racing and Training options. The Right side
tabs have been reorganised and associated with the toolbox.
To support the population of the Racing and Training left tool
the config dialog has been updated to enable the user to configure
the location of their workouts.
In addition, the config dialog now calls upon MainWindow to issue
a configUpdate() signal to notify widgets when config has been
updated. This is a refactoring of the existing mechanism that
only called realtimeWindow->updateConfig, now any widget can
connect to the MainWindow signal and re-read its config appropriately.
Currently, the TrainTool and RealtimeWindow widgets have been coded to
use this.
