deb: Use latest copyright-format
deb: Do not install license/*.txt

This change suppresses "W: extra-license-file"
deb: Suppress lintian message

This fixes W: hardening-no-relro
See http://lintian.debian.org/tags/hardening-no-relro.html
deb: Fix a typo

softwares ->
software
deb: Remove redundant copyright tag
deb: Add license paragraph
deb: Suppress lintian warning

W: description-synopsis-starts-with-article