Loop: CofV map CV level warnings

[SimonDedman]

C of V map: C of V map: 20% CV is a concerningly high figure. Ideally have a colour scheme which clearly illustrates when 20% is reached/passed (Cóilín). C of V is really important bit of thesis.

add barplot plotting, same sideways histogram style, descending order by average, listing min av max & somehow also variance. Bin & Gaus (assuming both run).