Better alert emails, improved group account

The email alerts should be more usable now. Before, you had to open the attachment to see the actuals results. Most results are just about a few assets and listing those in the email body itself would save a click. So that's what is done now. Some results are shown, up to a maximum of 10. If there are too many columns to show properly, the middle ones are cut out in the email body (but still all included in the attachment).

Another update is on group accounts. Some of you are responsible for multiple organisations that are not supposed to see each others data. This can be done with a groupaccount, where the subaccounts behave just like regular ShadowTrackr accounts but the groupaccount admins can see and search all data of all subaccounts.

As a groupaccount admin you can enter a subaccount and go back to the grouplevel, but it wasn't always very clear where exactly you were at a given moment. That is fixed now (it's shows in the bottom left, in bright yellow). Also some extra menu items are added to the groupadmin menu for better navigation.