Description of Problem:  After adding a public task folder containing
subfolders, only the root of the folder is listed in the tasks component.

Steps to reproduce the problem:
1. Add a public task folder containing task sub-folders
2. View task Component
3. Notice lack of sub task folders available for viewing :)

Additional Information: I can't think how Evolution could actually display
the subtasks nicely.  We organise our tasks by having many sub folders
containing the tasks.  In Evolution 1.4 we had a tree view which worked
fine, but since Evolution 2 it's been flattened.

I'm concerned that I'm not using Evolution correctly here but haven't had
much luck asking on the mailing list.  Apologies if this is my stupitidy
rather than a bug (or feature request :)