added VIPs link to navbar tools menu
made the "go back" button on the VIP page a bit more intelligent

if we came by way of a "all VIPs in a DC" search we re-do that DC search, if we came by way of a specific VIP search, we go back to the BigIP search page

also made auto IP address form detection reusable (so we can tell the user what type of search he/she's performing) and; and we now include the DC in the search-in-progress message