test_paths.py: add coverage for more I/O functions
test_paths.py: add coverage for more I/O functions

Test scipy.io.netcdf.netcdf_file, scipy.io.wavfile.read, and
scipy.io.wavfile.write.

ilayn/scipy,endolith/scipy,ilayn/scipy,person142/scipy,jor-/scipy,vigna/scipy,endolith/scipy,tylerjereddy/scipy,rgommers/scipy,grlee77/scipy,vigna/scipy,gertingold/scipy,Eric89GXL/scipy,lhilt/scipy,Eric89GXL/scipy,nmayorov/scipy,tylerjereddy/scipy,zerothi/scipy,perimosocordiae/scipy,matthew-brett/scipy,zerothi/scipy,WarrenWeckesser/scipy,lhilt/scipy,zerothi/scipy,endolith/scipy,e-q/scipy,anntzer/scipy,jamestwebber/scipy,jamestwebber/scipy,person142/scipy,pizzathief/scipy,lhilt/scipy,aarchiba/scipy,aeklant/scipy,mdhaber/scipy,scipy/scipy,lhilt/scipy,scipy/scipy,jor-/scipy,andyfaff/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,e-q/scipy,vigna/scipy,e-q/scipy,gertingold/scipy,pizzathief/scipy,arokem/scipy,scipy/scipy,WarrenWeckesser/scipy,aeklant/scipy,Stefan-Endres/scipy,nmayorov/scipy,tylerjereddy/scipy,arokem/scipy,tylerjereddy/scipy,Stefan-Endres/scipy,anntzer/scipy,rgommers/scipy,andyfaff/scipy,perimosocordiae/scipy,mdhaber/scipy,gfyoung/scipy,ilayn/scipy,pizzathief/scipy,ilayn/scipy,grlee77/scipy,Stefan-Endres/scipy,nmayorov/scipy,ilayn/scipy,grlee77/scipy,scipy/scipy,anntzer/scipy,andyfaff/scipy,gfyoung/scipy,tylerjereddy/scipy,andyfaff/scipy,matthew-brett/scipy,aeklant/scipy,pizzathief/scipy,matthew-brett/scipy,aeklant/scipy,arokem/scipy,Eric89GXL/scipy,matthew-brett/scipy,mdhaber/scipy,zerothi/scipy,Eric89GXL/scipy,person142/scipy,gfyoung/scipy,perimosocordiae/scipy,mdhaber/scipy,e-q/scipy,jor-/scipy,arokem/scipy,jamestwebber/scipy,lhilt/scipy,pizzathief/scipy,zerothi/scipy,jor-/scipy,scipy/scipy,anntzer/scipy,mdhaber/scipy,aarchiba/scipy,person142/scipy,matthew-brett/scipy,gfyoung/scipy,Stefan-Endres/scipy,andyfaff/scipy,Stefan-Endres/scipy,arokem/scipy,WarrenWeckesser/scipy,rgommers/scipy,aarchiba/scipy,WarrenWeckesser/scipy,gfyoung/scipy,nmayorov/scipy,perimosocordiae/scipy,gertingold/scipy,Stefan-Endres/scipy,gertingold/scipy,jamestwebber/scipy,Eric89GXL/scipy,person142/scipy,jor-/scipy,aeklant/scipy,aarchiba/scipy,e-q/scipy,jamestwebber/scipy,endolith/scipy,Eric89GXL/scipy,grlee77/scipy,vigna/scipy,zerothi/scipy,WarrenWeckesser/scipy,rgommers/scipy,endolith/scipy,ilayn/scipy,rgommers/scipy,grlee77/scipy,scipy/scipy,anntzer/scipy,aarchiba/scipy,nmayorov/scipy,perimosocordiae/scipy,andyfaff/scipy,endolith/scipy,gertingold/scipy,anntzer/scipy,vigna/scipy,mdhaber/scipy