live-build copyright notices

[jnqnfe@gmail.com]

since Daniel Baumann abandoned the live-build project a few years ago,
should the copyright notices not now be updated to reflect this?, i.e.

```
## Copyright (C) 2016 The Debian Live team <
debian-live@lists.debian.org>
## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
```

since effectively his copyright ownership covers up to the point where
he abandoned it and the live-team owns the versions with changes that
have been applied since.

similarly the authorship in the man pages.

should the notices in the files not also include references to which
license actually applies?

would you be open to an MR to address this if my doing the work helps?

Lyndon