Clarify /rules vote manipulation rule.
rulespage: Fix anchor to vote cheating wiki page.
Add sendreplies attribute to Link.
Modify js to allow checkboxes to send their checked state when desired.

If a checkbox has data-send-checked, send is(":checked") to the form field
instead of the checkbox's value (which is always 'on').

Allows for sending explicit unchecked state.
Allow gold users to optionally receive inbox replies to posts.
Ensure checkboxes and radios don't set form fields when unchecked.