cubicweb-fastimport #4835631 Remove numpy dependency [done]

Numpy is a bit heavy and not pypy friendly. And it is used only for its 'where' function, for a function (contiguousboundaries) that can easily be reimplemented.

prioritynormal
typeenhancement
done in0.3.0
load left0.000
closed by#bff467dda4c9 Reimplement numpy-dependent function
patchReimplement numpy-dependent function [applied]