TST: add tests of nextafter around 0
TST: add tests of nextafter around 0

Check that nextafter(0) gives number in range ]0 ... tiny[, and number
divided by 2 is 0 (denormal).

jakirkham/numpy,simongibbons/numpy,WarrenWeckesser/numpy,seberg/numpy,b-carter/numpy,madphysicist/numpy,chatcannon/numpy,ahaldane/numpy,jakirkham/numpy,mattip/numpy,bertrand-l/numpy,anntzer/numpy,charris/numpy,Eric89GXL/numpy,madphysicist/numpy,numpy/numpy,simongibbons/numpy,mattip/numpy,MSeifert04/numpy,grlee77/numpy,behzadnouri/numpy,anntzer/numpy,bringingheavendown/numpy,ssanderson/numpy,grlee77/numpy,bertrand-l/numpy,ahaldane/numpy,simongibbons/numpy,mhvk/numpy,tynn/numpy,abalkin/numpy,mhvk/numpy,mattip/numpy,MSeifert04/numpy,pdebuyl/numpy,bringingheavendown/numpy,madphysicist/numpy,b-carter/numpy,endolith/numpy,solarjoe/numpy,madphysicist/numpy,charris/numpy,numpy/numpy,behzadnouri/numpy,shoyer/numpy,mattip/numpy,pbrod/numpy,seberg/numpy,Eric89GXL/numpy,ahaldane/numpy,gfyoung/numpy,rgommers/numpy,chatcannon/numpy,MSeifert04/numpy,grlee77/numpy,pizzathief/numpy,behzadnouri/numpy,bertrand-l/numpy,jakirkham/numpy,ahaldane/numpy,shoyer/numpy,charris/numpy,pdebuyl/numpy,tynn/numpy,jorisvandenbossche/numpy,simongibbons/numpy,pdebuyl/numpy,numpy/numpy,MSeifert04/numpy,pbrod/numpy,ssanderson/numpy,grlee77/numpy,jakirkham/numpy,bringingheavendown/numpy,solarjoe/numpy,pbrod/numpy,WarrenWeckesser/numpy,pizzathief/numpy,jorisvandenbossche/numpy,Eric89GXL/numpy,anntzer/numpy,MSeifert04/numpy,jorisvandenbossche/numpy,mhvk/numpy,madphysicist/numpy,ahaldane/numpy,pbrod/numpy,rgommers/numpy,jakirkham/numpy,jorisvandenbossche/numpy,WarrenWeckesser/numpy,endolith/numpy,shoyer/numpy,rgommers/numpy,seberg/numpy,grlee77/numpy,chatcannon/numpy,Eric89GXL/numpy,tynn/numpy,jorisvandenbossche/numpy,pbrod/numpy,WarrenWeckesser/numpy,endolith/numpy,endolith/numpy,abalkin/numpy,pizzathief/numpy,b-carter/numpy,numpy/numpy,abalkin/numpy,charris/numpy,ssanderson/numpy,pdebuyl/numpy,rgommers/numpy,simongibbons/numpy,gfyoung/numpy,gfyoung/numpy,pizzathief/numpy,mhvk/numpy,seberg/numpy,solarjoe/numpy,WarrenWeckesser/numpy,anntzer/numpy,shoyer/numpy,shoyer/numpy,pizzathief/numpy,mhvk/numpy