Debian packaging fixes
* Updates maintainer scripts from latest version of `dh_make`
* Includes `rules` file
* Use `fakeroot` to build the package.
We use currently `dpkg-deb --build` instead of `debuild` or `dpkg-buildpackage`, so I don't know if the package is well-formatted for the latter. (one difference, the former works with uppercase `DEBIAN`, the latter lowercase `debian` -- that's why the directory was renamed)
This adds some source files, a script and skeleton for building
a Debian package that installs the zcash daemon and CLI tool.
Also removes unused Bitcoin files.