[Dev] UIDMap, osaf.app and KindCollections

[Morgen Sagen]

The ICalendar import/export code needs to be able to look up  
CalendarEvents based on their icalUID attribute; up until now  
maintaining this lookup mechanism has been the job of the UIDMap  
class in the sharing layer.  However, having that code live in the  
sharing parcel creates unwanted dependencies on that parcel, and it  
would be cleaner to have that code live in pim.calendar.  In  
addition, in the time since UIDMap was written, the repository's  
support for indexing has improved to the point we could replace what  
UIDMap does with an index on the CalendarEvent extent  
(KindCollection).  There is currently a CalendarEvent KindCollection  
living in osaf.app, but I think it makes more sense to move that  
collection to pim.calendar, so that code just wishing to use the  
calendar isn't tied to the osaf.app parcel.  So I am proposing we  
move the 'events' KindCollection from osaf/app/__init__.py to osaf/ 
pim/calendar/__init__.py (and change all (three) references to it  
accordingly).  There were already several +1 votes in IRC for this  
today.

Going through osaf/app/__init__.py I see five other KindCollections:   
notes, locations, mail, emailAddress, and scripts.  Should we also  
move those collections to live in their corresponding parcels?

~morgen