Description of problem:

Continuing the request in bug #794724. 

The task details page contains this information:

Creation Date: 	2012-01-27 16:30:43 +02:00
Updated Date: 	2012-02-06 16:31:33 +02:00
Owner: 	Alexander Todorov <atodorov@...>
Uploader: 	mkovarik


The Task.filter() method (in tasks.py) is not able to filter on it.

What I need to do is:

1) Filter all tasks where Owner=X and Creation Date in [start, end] - this will give me the tasks which were created by user X during the specified period.

2) Filter all tasks where Uploader=X and Updated Date in [start, end] and Updated Date > Creation Date - this will give me the tasks which were modified by user X after the initial import and modification took place during the specified period.