Add draft for template in debian jessie.

It's already working!
Restore installation of python dependencies via ${Python:Provides}.

Disable direct installation of globaleaks dependencies using pip.
Switch to a new branch for the development of debian packages relying on pip.
Merge branch 'devel' into debian
Merge branch 'devel' into debian-pip
Remove debian/.

This subfolder is going to be developed on different branches.
Merge branch 'debian' into devel
Merge branch 'debian-pip' into devel