Set default names for the chunks of problem set rmd files
| 1 2 | 
| rmd.file | file name | 
| txt | alternative the code as txt file | 
| only.empy.chunks | if FALSE (default) name all chunks. Otherwise only empty chunks are overwritten | 
| keep.option | if TRUE (default) don't change chunk options; otherwise clear all chunk options (dangerous) | 
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