Added findEntriesToRecategorize() to CategorizationPlan
Refactored createNewCategory() to newCategory() on CategorizationPlan
Refactored Category to use CategorizationPlans
Created CatPlan for DescriptionBasedCategory
Made Event cloneable.
Refactored Category implementations to be aware of the single arg
Category constructor.
Created TwoLevelCategory, for entries which inherently have two levels
of categorization in them.
Created a CatPlan for TwoLevelCategory
Removed the specialization implementation, ITHelpCategory: the new
TwoLevelCategory is a more general version of the same.
Created CatPlan for TicketCategory
Fixed TicketCategory and TicketPlan to adjust for small difference between
the old behavour of ITHelpCategory and new TwoLevelCategory
Updated testing starter script.
ab1c7f2393