TST: parameterize NAG, clarify names and comments
TST: parameterize NAG, clarify names and comments

This commit adds the complex NAG manual examples to the test along with the reals in a parameterized fashion. It also clarifies function names and adds comments to give sources and names of NAG examples. Lastly, fixes small typos.

pizzathief/scipy,andyfaff/scipy,tylerjereddy/scipy,person142/scipy,zerothi/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,aeklant/scipy,scipy/scipy,nmayorov/scipy,andyfaff/scipy,grlee77/scipy,mdhaber/scipy,mdhaber/scipy,zerothi/scipy,anntzer/scipy,aeklant/scipy,person142/scipy,ilayn/scipy,Eric89GXL/scipy,ilayn/scipy,scipy/scipy,mdhaber/scipy,ilayn/scipy,rgommers/scipy,pizzathief/scipy,perimosocordiae/scipy,matthew-brett/scipy,ilayn/scipy,matthew-brett/scipy,andyfaff/scipy,grlee77/scipy,anntzer/scipy,tylerjereddy/scipy,pizzathief/scipy,Eric89GXL/scipy,endolith/scipy,rgommers/scipy,endolith/scipy,pizzathief/scipy,e-q/scipy,andyfaff/scipy,Stefan-Endres/scipy,WarrenWeckesser/scipy,Eric89GXL/scipy,endolith/scipy,Eric89GXL/scipy,nmayorov/scipy,WarrenWeckesser/scipy,mdhaber/scipy,nmayorov/scipy,grlee77/scipy,perimosocordiae/scipy,zerothi/scipy,Stefan-Endres/scipy,vigna/scipy,e-q/scipy,scipy/scipy,andyfaff/scipy,Stefan-Endres/scipy,rgommers/scipy,WarrenWeckesser/scipy,scipy/scipy,zerothi/scipy,aeklant/scipy,perimosocordiae/scipy,endolith/scipy,mdhaber/scipy,anntzer/scipy,matthew-brett/scipy,vigna/scipy,Eric89GXL/scipy,andyfaff/scipy,pizzathief/scipy,anntzer/scipy,nmayorov/scipy,nmayorov/scipy,zerothi/scipy,vigna/scipy,scipy/scipy,ilayn/scipy,grlee77/scipy,aeklant/scipy,Eric89GXL/scipy,tylerjereddy/scipy,rgommers/scipy,person142/scipy,matthew-brett/scipy,Stefan-Endres/scipy,endolith/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,aeklant/scipy,tylerjereddy/scipy,endolith/scipy,tylerjereddy/scipy,rgommers/scipy,e-q/scipy,anntzer/scipy,zerothi/scipy,matthew-brett/scipy,perimosocordiae/scipy,grlee77/scipy,WarrenWeckesser/scipy,mdhaber/scipy,person142/scipy,e-q/scipy,ilayn/scipy,vigna/scipy,vigna/scipy,e-q/scipy,anntzer/scipy,scipy/scipy,person142/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy