Allow same Device Names (different groups)

So we could do that now - if you modified the alert message template so it didn't just say HOST but said HOST in groups GROUPS it would then include the groups that a host is in, in the alert message.  Of course, that would need to be done for all the alert messages, in all the DataSources..... (We may be able to do a bulk update for that on the backend, if you want.) The alternative would be to use the new email custom alert delivery method (which is just about to be released) which uses a global template for all alerts -but then you lose the datapoint specific information in each alert message (e.g. sequential table scans are generally an indication of a missing index stuff that is in a lot of messages.)