A minor blogwatcher enhancement

I've added a minor enhancement to BlogWatcher. It's so minor, in fact, that most people probably won't even notice it. It has to do with handling dates that are way out of line.

In the old version, BlogWatcher trusted the publication date for each item. In most cases, its still does. But there are three cases where it does not any more

1. The item lists a publication date in the future
2. The item lists a publication date far in the past
3. The item lists no publication date at all

In all cases, BlogWatcher will now record the date that it first "sees" such an item, and will use that, instead of one of these bogus values. If the item contains a "good" date, it will record it. Otherwise, it will use the current date and time.

I did this because one of my subscription items showed a publish date of January 4, 2007. So it always came to the top of the list. Now it will properly sink down the list as new items come up.