BaseOpenmrsData creator, dateCreated, uuid should be not updatable

The properties/columns

• creator
• dateCreated
• uuid

of BaseOpenmrsData object should be made updatable=false

Since they should only be set on INSERT and shouldnt change after that.

With updatable=true the persistence provider will not add these columns to an UPDATE statement.

see jpa docs for the annotation property http://docs.oracle.com/javaee/6/api/javax/persistence/Column.html#updatable%28%29

see discussion:
https://issues.openmrs.org/browse/TRUNK-4696