Lintian errors and warnings to clean up

[johnhamelink]

• W: exrmdeb: missing-depends-line
• W: exrmdeb: changelog-not-compressed-with-max-compression changelog.gz
• E: exrmdeb: file-in-etc-not-marked-as-conffile etc/init/exrmdeb.conf
• E: exrmdeb: file-in-etc-not-marked-as-conffile etc/systemd/system/multi user.target.wants/exrmdeb.service
• E: exrmdeb: control-file-has-bad-permissions preinst 0644 != 0755
• E: exrmdeb: control-file-has-bad-owner preinst 1000/1000 != root/root
• E: exrmdeb: no-copyright-file
• W: exrmdeb: description-starts-with-leading-spaces
• E: exrmdeb: unknown-control-interpreter control/preinst #!/usr/bin/env
• E: exrmdeb: systemd-service-file-outside-lib etc/systemd/system/multi-user.target.wants/exrmdeb.service
• E: exrmdeb: service-key-has-whitespace etc/systemd/system/multi-user.target.wants/exrmdeb.service at line 9