BUG: Set deprecated fields to null in PyArray_InitArrFuncs
BUG: Set deprecated fields to null in PyArray_InitArrFuncs

Initializing the deprecated fields to null ensures that if a
user sets them to their own function pointers, this can be
detected and the warning about using deprecated fields can be
printed.

charris/numpy,mhvk/numpy,mhvk/numpy,pdebuyl/numpy,grlee77/numpy,madphysicist/numpy,seberg/numpy,numpy/numpy,rgommers/numpy,anntzer/numpy,jakirkham/numpy,jakirkham/numpy,pbrod/numpy,seberg/numpy,madphysicist/numpy,endolith/numpy,anntzer/numpy,simongibbons/numpy,jakirkham/numpy,endolith/numpy,mattip/numpy,anntzer/numpy,grlee77/numpy,grlee77/numpy,mhvk/numpy,endolith/numpy,charris/numpy,numpy/numpy,seberg/numpy,pdebuyl/numpy,pbrod/numpy,mattip/numpy,grlee77/numpy,simongibbons/numpy,mattip/numpy,pdebuyl/numpy,jakirkham/numpy,grlee77/numpy,pbrod/numpy,pbrod/numpy,simongibbons/numpy,mattip/numpy,endolith/numpy,seberg/numpy,charris/numpy,numpy/numpy,anntzer/numpy,charris/numpy,madphysicist/numpy,madphysicist/numpy,rgommers/numpy,madphysicist/numpy,numpy/numpy,jakirkham/numpy,pbrod/numpy,simongibbons/numpy,simongibbons/numpy,pdebuyl/numpy,mhvk/numpy,rgommers/numpy,rgommers/numpy,mhvk/numpy