Temporary drafts

Temporary drafts
================
Original Author: Kristof Coomans

A new *status* value has been added to the system for version of content
objects. The status tells the system that the version has been created but not
been modified by the user. This combined with the last modification time of the
version can be used to clean up old entries, e.g. someone clicked 'create
comments' but didn't bother to post it.
They are considered old if they are older than 1 day.

The system will cleanup old drafts for these actions:

- login
- logout
- editing object

When they are executed it will remove all old drafts for the current user.

There is also a new cronjob called *internal_drafts_cleanup.php* which removes
old drafts from all users. It will only remove a maxium of 50 drafts each time
it is run. This cronjob is enabled by default.


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