Applying uscan(1) substitutions.

This fixes the 'repeated-path-segment' Lintian tag.

Grab PNG images into the resulting package.

 - Implement the `nodoc` build option.
 - Use secure scheme in copyright format.
 - Commit armored OpenPGP upstream signature.
 - Secure homepage link.
 - Add the Rules-Requires-Root filed.

Gbp-Dch: full

 - Update-the-NEWS-file-to-include-unpaper-7-release.patch
 - Remove-obsolete-Travis-CI-reference.patch

Update to upstream version '7.0.0'
with Debian dir 0c469137248cb12a48755063b1b3b63eaae8b9f7

see https://wiki.debian.org/Autoreconf

upstream/6.1

From Libav11 only setting the codec time_base triggers a warning.

This the correct pattern since Libav 0.6.

It was not really packaged, and it was the standard automake one, there's no reason to keep it around.