This patch introduces new functionality for working with
Heartrate based data.
* HR Zones can be defined, from Resting, Maximum and Lactate HR
* TRIMP metrics are calculated; TRIMP, TRIMP100 and Zonal TRIMP
* TRIMP metrics can be used to drive the PMC
* Time In Zone metrics for HR have been added
* Histogram window will now work with Power/HR zones
* User Settings have been added to record gender, weight and others
* RideFile has a new tag "Athlete" which is set to the athlete name
Fixes#140
