Reset plot when settings change

[Peter9192]

          Given default example and zooming into time series and then changing the runtime to 3600. The timeseries plot retains it zoom/pan so plot is empty. Would be nice to reset plot when plot axes range depends on user input.

Originally posted by @sverhoeven in #133 (comment)

[Peter9192]

Current behaviour is that plot resets when variable is changed - so this has been addresssed