Explore possible support of archivist package

[crsh]

archivist provides extended support for archiving R objects and sessions and allows adding references to the archived objects to the R Markdown document. It should be straight forward to support automated archiving of tables and figures in a paper by having apa_print() and apa_table() return the input objects. We could, for example, add a new option to the YAML header that ensures that figure and table captions include references to the displayed R objects (see example from the paper) and possibly even enable an easy application of license to these objects.