Compare feature, suggested improvements

[flyinfrog]

The compare feature is essential. It could be a really powerful tool for free flight pilots with little improvements.

Suggested improvements:

-Add two lines with the possibility to display windspeed and direction at two different additional altitudes (choosen by the user)
-Add a line with link to "better sounding" for the given model and time
-Add ability to select/unselect models, memorizeselection in user's perfil

as an example this is the meteogram of zygrib