[debian] Bump to 1.11.0 and fix lintian errors

Lintian fixes:
- usused-build-dependency-on-cdbs
- *-nmu (non maintainer upload)
- latest-debian-changelog-entry-changed-to-native
- missing-license-paragraph-in-dep5-copyright
Merge pull request #231 from sbadia/debian

[debian] Bump to 1.11.0 and fix lintian errors