Add missing vignettes for the plot types

[Yuri05]

At the moment we have this:

Vignettes for e.g. tornado plots, DDI-ratio plots etc. are missing

[Yuri05]

@pchelle Until this is done: do we have an overview somewehere in the package docu where all currently available plot types are listed?

[pchelle]

Added issue #374 to take care of this.
The issue lists the currently available plots in case

[pchelle]

@pchelle Until this is done: do we have an overview somewehere in the package docu where all currently available plot types are listed?

Actually, yes (but I am not sure if the documentation is 100% up to date).
Two sections for atom and molecule plots are available in https://www.open-systems-pharmacology.org/TLF-Library/reference/index.html

So the actual link would be https://www.open-systems-pharmacology.org/TLF-Library/reference/index.html#molecule-plots