Libkcal Recurrence updates

I have made some substantial revisions to the libkcal recurrence handling. The 
existing API is unchanged, but some new methods have been added. The notable 
changes are:

-- endDate() calculates the recurrence end date as necessary. So its return 
value is valid whether the recurrence is configured with a duration or an end 
date.

-- duration is now interpreted in terms of the number of occurrences of the 
event, not the number of time periods which repeat. So for example, a 
recurrence with a duration of 6 for a 3-times weekly recurrence will end 
after 2 weeks. Previously, it ended after 6 weeks. This change is to conform 
to RFC2445.

-- Additional recurrence modes are now handled: Minutely, Hourly and 
YearlyPos. These are so far untested, but I expect to test them out soon and 
hopefully fix any bugs.

-- There is a backwards compatibility mode (specified by compiling with 
-DLIBKCAL_BACK_COMPAT) which will interpret old-style KOrganizer-generated 
calendar files and convert them to the new format. The libkcal Makefile.am 
now includes this compile option.

-- a number of bugs have been fixed.

Cornelius - I checked KOrganizer's code to see if any changes are needed, but 
couldn't spot any. You may like to check it out for yourself in case anything 
has been broken.

-- 
David Jarvie
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