Draft: Added corrects method on EconomicEvent
Added a recursive from EconomicEvent to another EconomicEvent when the first event requires a correction or needs to be backed out completely. Negatives are allowed on quantities in this case.
This can also be used when a number of events need to be combined into one visually, such as in the time clock start/stop app.
NOTE: I added the property to the initial EconomicEvent definition, did not add anywhere else.