Make 'stamp' optional?

Currently the plot unconditionally adds a 'stamp':

Lines 148 to 150 in 7648251

    
           labs(caption = paste0("Plot made with deepdep v", 
        
                                 packageVersion("deepdep"), 
        
                                 " on ", format(Sys.time(), usetz = FALSE))

While it is clear what motivates (hey we all want credit) it is a little ... 'loud'. Would you consider hiding this behind a toggle that may well default to TRUE ?

Another good point from you!
Well, this package was created as a project for some course at my university, it was a training field for me and my colleagues and a lot of features that seemed reasonable then, are not so reasonable anymore...

Just to inform you, @eddelbuettel, together with @ErdaradunGaztea we are going to implement this and #19 through the weekend and udpate all this funny stuff like tests, docs and vignettes.

I just spent the few minutes this takes to patch the R file (all plot_dependencies.* variants) plus a roxygen2 run, using a default of TRUE as before. I can send you a PR if you want.

Your PR would be very welcome

I only gave it light testing so far but it seems to survive that :) (Also, I think I saw that you good folks already works on following tools in its "classification" of dependencies and set but I didn't yet see that in the mainline :-/ Maybe I misread work in a branch for merged work. One day...)

	labs(caption = paste0("Plot made with deepdep v",
	packageVersion("deepdep"),
	" on ", format(Sys.time(), usetz = FALSE))