Click-through on periodic tasks admin is hard to find

[RoelvandenBerg]

Only the enabled status is clickable in the periodic tasks admin:

This is default behaviour in the django admin, the first field is clickable for a detail view of the database object. I propose to also make periodic task and the task name clickable, for a more intuitive usage.

Example of how this improvement would look in the above example:

The solution can be found in this pullrequest: #526