Rdpack

Switched the BibTeX parser from package 'bibtex' to package 'rbibutils'. The change is transparent for most users. The new parser will make maintenance easier and offers potential for more features.

Functions for manipulation of R documentation objects, including functions for updating existing 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 during package building; and many functions for manipulation of references and Rd files.