update Debian files

The changes will eliminate the following Lintian tags:
```
E: mint-common source: source-contains-unsafe-symlink usr/bin/cinnamon-remove-application
W: mint-common source: debhelper-but-no-misc-depends mint-common
W: mint-common source: debian-rules-missing-recommended-target build-arch
W: mint-common source: debian-rules-missing-recommended-target build-indep
W: mint-common source: binary-arch-rules-but-pkg-is-arch-indep
W: mint-common source: ancient-standards-version 3.7.2 (current is 3.9.5)
W: mint-common: copyright-without-copyright-notice
E: mint-common: package-installs-python-bytecode usr/lib/linuxmint/common/configobj.pyc
W: mint-common: executable-not-elf-or-script usr/lib/linuxmint/common/launch_browser.sh
W: mint-common: executable-not-elf-or-script usr/lib/linuxmint/common/configobj.py
W: mint-common: executable-not-elf-or-script usr/lib/linuxmint/common/configobj.pyc
```