[ENHANCEMENTS]
Added WWW::Mechanize::Link object to encapsulate what used to
be an array reference of stuff from find_link(). This replaces
having to know that $link->[0] was URL and so on. However,
since WWW::Mechanize::Link is a blessed arrayref, it's backwards
compatible with existing code.The WWW::Mechanize::Link object now tracks what tag the link
came from (,