Reduced the frequency of refreshes, to avoid running over the Twitter call limit.
Post windows now use the same style as the main tweet window.
The length of posts is now calculated intelligently to account for link shortening. So if you paste in a long link, it won't use up all of your character count, as the link will be shortened in the actual post.
Auto-completion list for @users in post window now includes all users that the app has encountered.
Now correctly restores cached tweets and users when loading.