Added three new DATEVALUE formula functions: DATEVALUEDMY, DATEVALUEMDY, DATEVALUEYMD. Each has the ability to convert many date string notations to a date, as long as it knows what the order of day, month and year is.

Added fields to Slice to store ids of records that were created, updated or upserted in the load phase. These fields are also properly filled when running a recipe. This is a next step in moving the Record Id to Bread+Slice archive mapping to Salesforce.