Update plot recipe for SimData

[bbejanov]

• [ ] print plot_title at the top
• [ ] display single legend for all subplots: could be in an empty subplot (e.g. if grid is (nrow, ncol) and there are fewer than nrox*ncol variables, the empty plot in the bottom right could display only the legend) or could be outside the grid of plots.
• [ ] support optional keyword arguments nrow and ncol. If both are given, that'd be the same as layout = (nrow, ncol). We need the case of only one of them given and the other computed from the number of variables, with some subplots potentially left empty.

[kunov]

@bbejanov

I'll try to tackle this (I noticed "help wanted" badge)

Procedure:

• start here: https://github.com/bankofcanada/StateSpaceEcon.jl/blob/master/src/plotrecipes.jl
• I'll open a pull request
• then go and attempt steps 1-3

[bbejanov]

Great, thanks Atai!

[bbejanov]

plot recipe moved to TimeSeriesEcon