Keeping an offset for page switching

There is a new parameter in the URL of the network page: "offset". It stores the first date of the first page. This helps with page switching.

The problem was, that you scrolled down the first page. Before you clicked on "next page" there were maybe 3 new messages loaded at the top. When you then switched to the second page, then you saw 3 old messages from the end of page 1. This can really be annoying - especially when you use the function to add the content at the bottom of the page.