Add new standard parameters to link sink API

For example XWik supports the following parameters:
http://platform.xwiki.org/xwiki/bin/view/Main/XWikiSyntax#HLinks

Here are some that could be added as standard parameters:

• query string
• anchor
• interwiki link (maybe)

Other parameters are specific to XWiki (space, subwiki, page name, etc), and thus we should also have a generic way of adding parameters, see DOXIA-204