Added book
as a second BibTeX type that should be
used in priority when getting the reference of a package (previously,
the priority was given to manual
entries only). This allows
for a slightly better handling of multi-reference packages by using a
more general reference when there’s a book
but no
manual
BibTeX entry available (#15).
as.data.frame.pkrt_list()
now arranges packages in
alphabetical order (#13).