opts_attacher: attacher options
In renlund/attacher: Attach Graphs and Figures to PDF:s

This list tries to mimic the behaviour of opts_chunk from knitr. Currently these values are maintained with the functions in (the list) opts_attacher:

attach_graph - use fig_cap in fig.caption (in a knitr chunk), i.e. fig.caption = fig_cap("My Caption"), this forces fig_cap to include an attach-statement pointing to the relevant figure in 'figure/' .
attach_table - if TRUE attached tables in caption created with tab_cap (default FALSE). You can use the added hook 'tab.cap' (analogous to knitr 'fig.cap'), i.e. tab.cap = tab_cap("My caption", ...).
table_path a subdirectory in which to store table files (default "attacher_tables")
graph_dev - graphical extension (default "pdf")
table_ext the extension for the table files (default "csv")
table_fnc - this is the function to write the object argument in tab_cap to file (default utils::write.csv)