NEP: accept NEP 20 partially (frozen and flexible) (#11429)
NEP: accept NEP 20 partially (frozen and flexible) (#11429)

Defer the part on broadcastable dimensions.
gfyoung/numpy,madphysicist/numpy,pbrod/numpy,grlee77/numpy,jorisvandenbossche/numpy,MSeifert04/numpy,WarrenWeckesser/numpy,mattip/numpy,MSeifert04/numpy,rgommers/numpy,endolith/numpy,grlee77/numpy,rgommers/numpy,mhvk/numpy,MSeifert04/numpy,pbrod/numpy,anntzer/numpy,pdebuyl/numpy,rgommers/numpy,mattip/numpy,jakirkham/numpy,simongibbons/numpy,simongibbons/numpy,endolith/numpy,seberg/numpy,abalkin/numpy,charris/numpy,anntzer/numpy,madphysicist/numpy,pdebuyl/numpy,madphysicist/numpy,grlee77/numpy,charris/numpy,simongibbons/numpy,seberg/numpy,anntzer/numpy,ahaldane/numpy,pizzathief/numpy,shoyer/numpy,WarrenWeckesser/numpy,numpy/numpy,simongibbons/numpy,seberg/numpy,madphysicist/numpy,endolith/numpy,WarrenWeckesser/numpy,anntzer/numpy,ahaldane/numpy,jorisvandenbossche/numpy,gfyoung/numpy,shoyer/numpy,seberg/numpy,ahaldane/numpy,pizzathief/numpy,WarrenWeckesser/numpy,mattip/numpy,abalkin/numpy,madphysicist/numpy,shoyer/numpy,pizzathief/numpy,ahaldane/numpy,numpy/numpy,grlee77/numpy,shoyer/numpy,mhvk/numpy,simongibbons/numpy,gfyoung/numpy,ahaldane/numpy,numpy/numpy,jakirkham/numpy,pbrod/numpy,jorisvandenbossche/numpy,mhvk/numpy,jorisvandenbossche/numpy,MSeifert04/numpy,rgommers/numpy,jakirkham/numpy,shoyer/numpy,pizzathief/numpy,numpy/numpy,pdebuyl/numpy,mattip/numpy,mhvk/numpy,jakirkham/numpy,charris/numpy,endolith/numpy,jorisvandenbossche/numpy,pdebuyl/numpy,pizzathief/numpy,pbrod/numpy,charris/numpy,abalkin/numpy,WarrenWeckesser/numpy,grlee77/numpy,mhvk/numpy,jakirkham/numpy,pbrod/numpy,MSeifert04/numpy