New PostXING release

I've added a small usability feature based on some recent feedback.

Now, from the Tools -> Options dialog, you can optionally set whether you would like to automatically create a new post when you hit Post or Post & Publish. I also made some minor UI consistency changes, and removed a superfluous message that showed up in the options dialog in the last release (oops :)

So, go grab the new PostXING. Enjoy.