Slideshow enhancements

There are now pause, skip and previous buttons. But they are only visible when moving your mouse.

Other optimizations
We optimized the new portal creation proces. It’s creation process speed has gone up with more than 200%.

You could theme almost everything, but we missed some less frequently seen buttons and headers.

When a datasource isn’t updated correctly, an alert in the Webdashboard was given. This didn’t prove the correct place, because the users of the report noticed these before the users that can excually fix the datasource connection. So now when a refresh fails, alle the portal admins also receive an E-mail.