Added incomplete implementation for yearly report category.

Added KDateTypeYearly constant and -isYearly method to ReportCategory.
Modified calculation of autoingestion jobs in ReportCategory to handle
daily, weekly and yearly reports.  Made an initial guess as to number of
yearly reports available.

Added -fiveNewYearsAgoForDate: and -nextYearForDate: methods to
NSCalendar (Autoindigestion) category, with default implementations
for now.

Added initial unit test for NSCalendar (Autoindigestion).