More advanced plotting control

[davidwilby]

Following from discussions on #14:

Sorry for the delay David, my thoughts on the questions below:

Do we want plotting to be an option in the asli_calc command?

I think if there is a separate asli_plot function that is enough, does not need to be both. Especially because under asli_calc you get into a mess with the output filename parameter which is already there for .csv output

How many plot options do we need in general and in the asli_plot command?

filename (and format), year/month or all, handling image sizing (width, height, maybe dpi not sure what the python libraries do compared to ggplot2)

write out the file - probably yes, it's not in there yet

Yes

set time bounds on the plotting?

I guess you might want to plot a different range from what comes out of asli_calc? Not sure

option to just plot a single month?

I suppose the flexibility could be handy, but not a requirement atm. Maybe something we can add down the line.