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.

This allows loading tiff files with libav without waiting for libav 11 but
it will create colour files by default, even though the image would be
grayscale only.

libav 11 supports grayscale tiff files as grayscale rather than palettized,
but until then, this workaround should work.