Multiple Users & Posted By

I've completed some necessary changes required to adequately utilize having multiple users on the blog.  This was a realization I had shortly after completing the user management. If you're going to have multiple users, you need to distinguish who posted what!

At the time I did the user management I was thinking of the longer term where someone could register and post comments more easily.  But I hadn't really thought about the mid-term of allowing multiple users to post to the blog.  It's a natural extension, thus a few changes to the entry table, the login process and a slew of changes to the add/edit/display functions and voilà, multi-user PolarBlog!

And the end result that you see?  Well, not much.  Just the "Posted by" line that you now see in the header of all of the posts.