make help menu a template

Move Help shortcut to the top, "external" Icon, and make it templated. 

![capture decran 2014-01-16 a 12 02 53](https://f.cloud.github.com/assets/335567/1934359/4fcd3c90-7ee9-11e3-89c2-88778d7669c7.png).

Not yet "configurable", cause we should decide on where/how to do that on a per kernel basis.