Bug#886036: Improve changelog version parsing

[Felix Lechner <felix.lechner@lease-up.com>]

Dear Chris,

On Mon, Jan 1, 2018 at 1:41 PM, Chris Lamb <lamby@debian.org> wrote:
> (Could you push these to a Git repository somewhere? That would make
> them easier to apply... Thanks in advance!)

Please have a look at https://github.com/lechner/lintian. The repo
contains my locally synchronized copy of your master as well as my
branch 'improve-changelog-version-parsing'. Each commit passes all
tests and is perl-tidy.

Unfortunately, I annotated the patches manually in greater detail. You
may wish to consult them. The upshot is:

Many version checks happen on binary packages in
checks/changelog-file.pm, although they may be more helpful on source
packages. Per suggestion from Paul Wise, one could check that binary
packages ship with the source changelog. If the maintainers are
receptive to part of this patch series, the author would be happy help
consolidate further checks in checks/source-changelog. Thank you!

Best regards,
Felix