set flags at all (i.e. through early returns) or only UNTOUCHED
flags. This breaks the positional flagging scheme, which should
have one digit for every funtion applied.

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.

Revert "refactored register.py as @schaefed suggested, renamed former CallCtrl to CallState and made it more KISSier"

This reverts commit df70798c.

refactored register.py as @schaefed suggested, renamed former CallCtrl to CallState and made it more KISSier

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