- fixed copy-tests
- fixed deepcopy attrs in dios

the previous implementation, would only mark the start and end point(s) of a constant plateaus if it is as big as window or larger.

the word 'Flagger' now is History, we have 'Flags' now (except for plotting, which is old and deaf and probably die soon anyway)

also removed peculiar neg-operator

 - inverse interpolation
 - inverse aggregation
 - shift
 - resample