[Design] Adding the filtering checkboxes to the subscribe dialog

[Morgen Sagen]

The new sharing framework that will be put in place soon has much  
better support for filtering than the old framework (filtering should  
actually work :-).  Each participant (publisher or subscriber) in a  
shared collection will have control over what fields they choose to  
share (triage status, alarms, etc.), completely independent of what  
other participants have selected.  For example, if user A declines to  
share triage status, but users B and C decide to share it, user A  
won't see B and C's triage values, but B and C will see each  
other's.  In the old framework, everyone had to agree on the same set  
of filters.

Therefore I propose we add the four checkboxes that are in the  
publish/manage dialog (Share alarms, event status, triage status, and  
needs reply status) to the subscribe dialog as well.

~morgen