quotaholder: Store timestamps using DateTimeField
Add new fields issue_datetime in Commission and issue_datetime,log_datetime in ProvisionLog. Migrate away from custom string-basedissue_time and log_time fields.
quotaholder: Add migrations
Migration 0001 should be faked on an existing database.Migration 0002 adds new fields.Migration 0003 populates the new fields based on the old ones.Migration 0004 deletes unneeded fields and tables.
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