Cleaning up Lintian errors and warnings

/etc/.. files related to Upstart and SystemV weren't correctly marked as configuration files and upgrading the package could cause any changes made by the system administrator to be lost. This generates a 'file-in-etc-not-marked-as-conffile' error in Lintian.

Symlinks to files which are in the same top-level directory should be relative according to debian policy; handy when  installing packages into a jail or using non-standard system layout. Symlinks created in /usr/bin weren't creating a relative symlink to /usr/share/<app>/bin

This fixes the common Lintian errors but there are one or two warnings remaining