Improved forward_link

Hi,

The patch enclosed does 2 things in forward_link function:

1. Set the $links['forward_links']['attributes'] with the 'forward_page_title' variable instead of t('Forward this page to a friend').

2. Improve the link generation by initializing $links['forward_links']['query'] as an array instead of a simple string in order to ease post-processing. For example at template layer, one could use array functions (like array_merge in my situation) to alter the query part w/o bothering with '&' between URL parameters.

Thanks