Data history view

[lislis]

Cases should behave a little like immutable data in a sense that each time a change to a case is made it is saved as a new record in the database instead of updating the previous record. With this we can build a history of changes on a case and can jump back if necessary. For this the cases (aka records) needs another field to save a unique identifier per individual case (not to be confused with the human readable identifier as it's not uniq or the uuid with is uniq for each version of each case). Then all saving etc needs to be adjusted accordingly and a case history view needs to be build