Conical Ess

## Short document about new Conical End of Speed Section functionality ##
+ thanks to Jacques Fournier for this documentation and test

### 1 - Configuration ###

In a task, you can now define a new turnpoint type: Conical ESS

![image](https://f.cloud.github.com/assets/858626/1844722/7ef7aa38-754c-11e3-8c76-0e5f2646d02d.png)

With 2 parameters:
- Slope
- Base (Cone base in absolute altitude (AMSL))

![image](https://f.cloud.github.com/assets/858626/1844725/9d764348-754c-11e3-9c89-54786d80fea3.png)

Note in the task overview, the different turnpoint icon.
Cone slope is displayed where usual cylinder radius used to be.

![image](https://f.cloud.github.com/assets/858626/1844726/ad35f79c-754c-11e3-8de0-d88a4449ca9e.png)

#### 2 - In the race ###

The ESS Cone, is showed like a cylinder turnpoint with some more dash inside cylinders, see figure bellow.
The cone optimized point to reach is calculated according to your actual altitude, the Mac Cready speed value, wind direction and speed value, and cone parameters.
It is constantly recalculated, and if you take a lift or a big sink, the cone main radius will change according to you new positions and altitude values.

![image](https://f.cloud.github.com/assets/858626/1844727/c8318462-754c-11e3-99d9-9bd432667eec.png)