Mark the edit form, new comment form, and unvote links as hidden in
html, instead of showing them by default then hiding them later in
Javascript. This eliminates flickering on page load.
* Add 'post as moderator' option to comment form. This creates a so-called sticky comment.
* Downvotes have no effect on stickied comments; they're always visible, regardless of comment thresholds.
* Only mods may sticky comments.
* Mods may sticky comments by other users.
