Update debian changelog to avoid lintian errors

Update debian changelog to avoid lintian errors

New version - 1.6.1

Change the version in debian/changelog

Change debian maintainer e-mail address

New version released - 1.5.4 + Updated documentation

Update version to 1.5.3

Update version to 1.5.2

Update version number to 1.5.1

Bugfix - version tag was not updated to 1.5.0