Develop plotwind

I added an option to plot the winds in PlotEquiMap. I understood that @mmenegoz @eexarchou  are interested in this feature. If it true would you mind to test it?

See merge request !32

Toymodel

A synthetic forecast generator for s2dverification which allows to test sensitivities with regard to predictability, forecast error, ensemble size and hindcast length. The toymodel allow furtherto test new functions in s2dverification and can be used for tutorial purposes. @fmassonnet and @eexarchou , could you review this function? Many thanks!

See merge request !35

Develop composite

@cprodhomme  (thanks for checking this new function Composite.R within a week or two)

See merge request !33

Merge branch 'develop-composite' of https://earth.bsc.es/gitlab/es/s2dverification into develop-composite

Develop load check sd in paths

See merge request !100