Alerts page enhancements

[bnb]

I know you've mentioned you want to add the ability for users to manually delete alerts and to have an enhanced alerts listing page, so I thought I'd provide some specifics on how I would like to see this implemented in the plugin.

1. A clear all notifications button, which deletes both all read and unread notificaions.
2. A clear all read notifications button, which clears notificaions that have been previously viewed.
3. Individual deleting of notifications
4. Show the title of the thread (or PM) in addition to a link to the specific post.
5. Show the content of the post, PM, rep, etc. up to around 300 or so characters with an ellipsis and "Read more" at the end. Offset this block of text by putting it in a blockquote with special styling which uses the same CSS as a regular quote, but without the "Quote by userName" section at the top.
6. [100% up for debate] If there are multiple notifications fom one thread, make them compound. Write something like... > Euantor, Tierney, and three others have alerted you.

[euantorano]

I'll see what I can do. The post previews might be a bit much though as I'd prefer to keep to a simple one line type of affair if possible.