This now assumes that a running changelog is maintained in
src/debian.changelog, i.e., at the same level as the subsurface tree; the
organization now should look like this:
src/debian.changelog
src/subsurface # subsurface git checkout
src/subsurface/libdivecomputer # libdivecomputer git Subsurface-xx branch
src/subsurface/marble-source # marble git Subsurface-xx branch
src/subsurface/libgit2 # libgit2 git checkout
Instead of running dh_make to create all new debian build files, we add the
necessary files in our script.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>