Enhance Task Report Macro

In addition to CONFSERVER-38287 I would like suggest further improvements to the Task Report Macro.

• It should be possible to restrict the listed tasks to current page (without knowing the name/id of the current page, useful for templates)
• It should be possible to list the tasks of a given page tree (current/given page and all child pages)
• It should be possible to list both completed and incomplete tasks at the same time
• The huge banner which is shown for an empty task list should be optional (or removed)
• The location link should point directly to the task position not just to the page. (would require an automaic anchor for tasks)