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external function calculates contrast value and returns Image with
contrast values instead of channel value (3>1). This is calcualted with
np.histogram

accordingly to the scope of the class which now is not a specific
contrast but a way to represent contrast. This is more consistent with
what the data represents and how to work with the data.

only two for testing reason
subclassing a subcalls of numpy was hard due to the use of __new__ and
__array_finalize__
max recursion errors appear now after multiple use of derive. Do I need
numpy's __del__ method?

just as a reference implementation for the value contrast and not generacilly

so that it is not accessible by the instance

reference implementation for Movie, Frames class
scatterplot contrast without plot as function in contrasts module
helper functions in helpers module

due to obsolation