More strict separating of the directory structure on building packages

[Removed by request]

I'm using Ubuntu 15.10 dev with dpkg 1.17.25ubuntu1 and on building a package with dpkg-deb it mixes the DEBIAN directory with the applications reflection of its file structure. I think this could be made more clean by separating this. Instead of putting the file structure of the application besides the DEBIAN directory it could also have its own subdirectory (this would also solve the problem that on the filesystem the /DEBIAN directory can't be created by a package (in case any user should need this)).