fix copy simple

Bert Palmrequested to merge
copyshop2 into develop
  • rm Flags.history auto-copy
  • added copy-kw to History.reindex + adjusted tests for that
  • shallowcopy in _sliceHistory
  • added __deepcopy__ and __copy__ and copy(deep:bool) consistently to History, Flags, Saqc
Edited by Bert Palm

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