Develop downscaleR format

See merge request !107

Develop clusters

@fmassonnet  as the tester for this

See merge request !91

Develop smoothing

See merge request !106

Smoothing(): added security checks, fixed cases where runmeanlen is odd, generalised to work on arrays of N dimensions.

Changed Toymodel to ToyModel.

See merge request !105

Develop plots

Plot functions updated to accept ellipsis arguments (...), and to show the plots or save them into a file in several extensions. Updated the warning and information messages using the standard functions.

See merge request !104