| check_for_doxygen | check for doxygen | 
| c_test | R frontend of the C function bar | 
| doxy | Calls doxygen for an R package | 
| doxy_edit | Edits an existing Doxyfile | 
| doxy_init | Prepares the R package structure for use with doxygen | 
| replace_tag | Updates and adds doxygen options in a line string vector |