if the history is altered manually (by a data proc function) newly inserted indexes and data must be
not masked and therefore must use `True` as default value for the mask. Otherwise nan's could be
propagate through the history. Hard to explain...

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

and another for Config calls