Unload of "TEM Planer" can fail with "Something goes wrong"

[Hasenkopf, Andreas]

When the browser wants to close the window showing the TEM Planer (or when a different web page is requested) while Dajaxice processes are active each one might raise a "Something goes wrong" alert.

There should be silent failing, e.g. by disabling the error message (see http://docs.dajaxproject.com/dajaxice/custom-error-callbacks.html) or by stopping the periodic refreshing (see http://stackoverflow.com/questions/109086/stop-setinterval-call-in-javascript).

[Hasenkopf, Andreas (andi-hasenkopf)]

With milestone 3.0 this submodule will be removed from the project.