PropertySubset: cache generating fixed
Property: quantity support added
Property: isWhole() check
PropertySubset: cache name changed
Event.PropertyManager: containing checker methods removed
TimeTable: label support added
Document class added
Event: some modifications
Document: stores with correct expel() methods
Document: stores' register() returns with the registered object
Block length is a long now
Event: simple constructor added
Document: PeriodStore added
Event: property removing fixed
Main: Document tests...