Functions for manipulation of R documentation objects, including
functions reprompt() and ereprompt() for updating 'Rd' documentation
for functions, methods and classes; 'Rd' macros for citations and
import of references from 'bibtex' files for use in 'Rd' files and
'roxygen2' comments; 'Rd' macros for evaluating and inserting snippets
of 'R' code and the results of its evaluation or creating graphics on
the fly; and many functions for manipulation of references and Rd
files.