Remove unnecessary constraints

See merge request !4

* Build-Depends: Drop versioned constraint on qtbase5-dev (>= 5.5.1).
* Build-Depends: Drop dependency on essential package dpkg-dev (>= 1.16.9).

Changes-By: deb-scrub-obsolete

Fix some issues reported by lintian

See merge request !5

Changes-By: lintian-brush
Fixes: lintian: out-of-date-standards-version
See-also: https://lintian.debian.org/tags/out-of-date-standards-version.html

Changes-By: lintian-brush
Fixes: lintian: mismatched-override
See-also: https://lintian.debian.org/tags/mismatched-override.html

Fix some issues reported by lintian

See merge request !3

Changes-By: lintian-brush
Fixes: lintian: debian-rules-uses-as-needed-linker-flag
See-also: https://lintian.debian.org/tags/debian-rules-uses-as-needed-linker-flag.html

Changes-By: lintian-brush
Fixes: lintian: out-of-date-standards-version
See-also: https://lintian.debian.org/tags/out-of-date-standards-version.html

Fix some issues reported by lintian

See merge request !1

Fixes: lintian: debian-changelog-has-wrong-day-of-week
See-also: https://lintian.debian.org/tags/debian-changelog-has-wrong-day-of-week.html

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

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

Upstream version 2.2