python bsddb3: move and update expression

The updated expression uses buildPythonPackage and thus installs a
wheel. Unfortunately, setting the --berkeley-db flag seems to fail.

pkgs/development/python-modules/bsddb3/default.nix

@@ -1,12 +0,0 @@
-{stdenv, fetchurl, python, db}:
-
-stdenv.mkDerivation rec {
-  name = "bsddb3-6.1.0";
-  src = fetchurl {
-    url = "https://pypi.python.org/packages/source/b/bsddb3/${name}.tar.gz";
-    sha256 = "05gx3rfgq1qrgdmpd6hri6y5l97bh1wczvb6x853jchwi7in6cdi";
-  };
-  buildInputs = [python];
-  buildPhase = "true";
-  installPhase = "python ./setup.py install --prefix=$out --berkeley-db=${db}";
-}