Set default names for the chunks of problem set rmd files
name.rmd.chunks(rmd.file = NULL, txt = readLines(rmd.file),
only.empty.chunks = FALSE, keep.options = TRUE, valid.file.name = FALSE)
file name
alternative the code as txt file
if FALSE (default) name all chunks. Otherwise only empty chunks are overwritten
if TRUE (default) don't change chunk options; otherwise clear all chunk options (dangerous)