fix copy simple
- rm Flags.history auto-copy
- added copy-kw to History.reindex + adjusted tests for that
- shallowcopy in _sliceHistory
- added
__deepcopy__and__copy__andcopy(deep:bool)consistently to History, Flags, Saqc
__deepcopy__ and __copy__ and copy(deep:bool) consistently to History, Flags, Saqc