[Checkins] [zopefoundation/ZODB] e56163: DemoStorage: fix history()

[GitHub]

  Branch: refs/heads/ds-conflict-history
  Home:   https://github.com/zopefoundation/ZODB
  Commit: e561636a9e9b5c53ff4adb9bd7f4ff2fb0d0b6cd
      https://github.com/zopefoundation/ZODB/commit/e561636a9e9b5c53ff4adb9bd7f4ff2fb0d0b6cd
  Author: Julien Muchembled <jm at nexedi.com>
  Date:   2016-05-05 (Thu, 05 May 2016)

  Changed paths:
    M src/ZODB/DemoStorage.py
    M src/ZODB/MappingStorage.py
    M src/ZODB/tests/HistoryStorage.py
    M src/ZODB/tests/testDemoStorage.py

  Log Message:
  -----------
  DemoStorage: fix history()

- It failed with oids that already exist in the base storage.
- MappingStorage returned timestamps in wrong format.