Remove support for sub-packages in sub-folders again (at least for now).
Remove support for sub-packages in sub-folders again (at least for now).

This is not yet handled by the registry at all, and handling it will require some effort and a lot more bandwidth for communicating with the repository hoster.

jeanbaptistelab/dub,jelmansouri/dub,nazriel/dub,Flamaros/dub,p0nce/dub,schuetzm/dub,xentec/dub,Geod24/dub,Abscissa/dub,alexeibs/dub,grogancolin/dub,y12uc231/dub,gedaiu/dub,D-Programming-Language/dub,Abscissa/dub-data-mod,rjframe/dub,dreamsxin/dub