Upstream version 3.12.0

Fix some issues reported by lintian

See merge request !1

Changes-By: lintian-brush
Fixes: lintian: uses-debhelper-compat-file
See-also: https://lintian.debian.org/tags/uses-debhelper-compat-file.html

Changes-By: lintian-brush
Fixes: lintian: package-uses-old-debhelper-compat-version
See-also: https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html

Changes-By: lintian-brush
Fixes: lintian: homepage-field-uses-insecure-uri
See-also: https://lintian.debian.org/tags/homepage-field-uses-insecure-uri.html

Update to upstream version '3.11'
with Debian dir 19555c77b529430e8e6d503cface1e9a40726fdb

Update to upstream version '3.8'
with Debian dir c983080f0464a6b8d1519d710bc0234a3914e517

Update to upstream version '3.7'
with Debian dir 7d22fe9ca7c445cc3fda35e40771242767b847dd