### fixing map_coordinates

Scipy intoduced another paramter for padding, which apparently was zero before. Fixing this. The scipy change is: https://github.com/scipy/scipy/commit/9c299da04b9c419786a56c8e657aaabeb35f9069 Alex noted, that on his implementation, using the normal `map_coordinates` function was really slow. (I am guessing due to extra memory allocation), which is why he called the C-Function directly and did all the checks within postpic. So keep it as is for really fast coordinate mapping :) Fix #261

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