Vignette/Suggests CRAN issue

[ailich]

Packages in Suggests should be used conditionally: see 'Writing R Extensions'.
This needs to be corrected even if the missing package(s) become available.
It can be tested by checking with R_CHECK_DEPENDS_ONLY=true.

[ailich]

• remove calls to library for packages under Suggests. Instead use ::
• For qmetrics.jpg, that is generated by cowplot so will need to make the html code conditional
• Either if statements or dynamic evals in R chunks for Suggests

{r Topo, eval = has_tmap & has_colorRamps, echo= FALSE, message=FALSE}

or

if (requireNamespace("tmap", quietly = TRUE)) {
      tmap::tm_(...)
   }