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

Fix in Load check of start date in path pattern.

See merge request !103

Develop nao fixes

See merge request !102

Changed name to PlotBoxWhisker().

See merge request !101