BUG: Fix refcounting in add_newdoc
BUG: Fix refcounting in add_newdoc

this is a trivial refcounting fix, since this function is mostly
used only at startup, the small refcounting issue was not noticed
until the new tests were added.

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