Bug#649530: [copyright-format] clearer definitions and more consistent License: stanza specification

[Jonathan Nieder <jrnieder@gmail.com>]

Hi,

Ximin Luo wrote:

> When packaging mozilla extensions I ran some problems with DEP5. I talked this
> issue over on #645696 which eventually resulted in encouragement to move forward
> with a proposal for a change to be made.

I think this report contains multiple proposals.  Let me try to
summarize (and please correct me where I go wrong).

First, the problem being addressed: a debian/copyright file like this:

	Files: *
	Copyright: yyyy-yyyy etc
	License: GPL-2+

	License: GPL-2
	 etc

or this:

	Files: *
	Copyright: yyyy-yyyy etc
	License: GPL-2 with Font exception

	License: GPL-2
	 etc

is not considered valid because there is no "License: GPL-2+"
or "License: GPL-2 with Font exception" paragraph.  Right?