[PATCH 1/8] fix compact function: also remove non null members with length 0

Signed-off-by: todeschi <adrien.todeschini@inria.fr>
[PATCH 2/8] fix authors section on index page. In case of multiple authors in authors@r, the Authors section title was duplicated with empty content. Added a str_person function to properly display person objects.

Signed-off-by: todeschi <adrien.todeschini@inria.fr>
[PATCH 3/8] {{{title}}} instead of {{title}}. no html escape for titles with \code tags.

Signed-off-by: todeschi <adrien.todeschini@inria.fr>
[PATCH 4/8] fix inside-r links to r builtin packages

Signed-off-by: todeschi <adrien.todeschini@inria.fr>
[PATCH 5/8] fix Value section and parse_descriptions. "Writing R extensions" manual says: "Note that \value is implicitly a \describe environment."

Signed-off-by: todeschi <adrien.todeschini@inria.fr>
[PATCH 6/8] change plot size to 540x400: better for par(mfrow=c(2,2))

Signed-off-by: todeschi <adrien.todeschini@inria.fr>
[PATCH 7/8] keep only high level plots. added slightly modified knitr functions: merge_low_plot, digest_plot, is_low_change

Signed-off-by: todeschi <adrien.todeschini@inria.fr>
[PATCH 8/8] update documentation

Signed-off-by: todeschi <adrien.todeschini@inria.fr>