* ftp.c (ftp_retrieve_list): Use new INFINITE_RECURSION #define.
* html.c: htmlfindurl() now takes final `dash_p_leaf_HTML' parameter.
Wrapped some > 80-column lines. When -p is specified and we're at a
leaf node, do not traverse <A>, <AREA>, or <LINK> tags other than
<LINK REL="stylesheet">.
* html.h (htmlfindurl): Now takes final `dash_p_leaf_HTML' parameter.
* init.c: Added new -p / --page-requisites / page_requisites option.
* main.c (print_help): Clarified that -l inf and -l 0 both allow
infinite recursion. Changed the unhelpful --mirrior description
to simply give the options it's equivalent to. Added new -p option.
(main): Added some comments; handle new -p / --page-requisites.
* options.h (struct options): Added new page_requisites field.
* recur.c: Changed "URL-s" to "URLs" and "HTML-s" to "HTMLs".
Calculate and pass down new `dash_p_leaf_HTML' parameter to
get_urls_html(). Use new INFINITE_RECURSION #define.
* retr.c: Changed "URL-s" to "URLs". get_urls_html() now takes
final `dash_p_leaf_HTML' parameter.
* url.c: get_urls_html() and htmlfindurl() now take final
`dash_p_leaf_HTML' parameter.
* url.h (get_urls_html): Now takes final `dash_p_leaf_HTML' parameter.
* wget.h: Added some comments and new INFINITE_RECURSION #define.
* wget.texi (Recursive Retrieval Options): Documented new -p option.
