[colord] Inconsistent copyright in some directories

[Christopher James Halse Rogers]

I've just gone on a refresh of the debian/copyright information for the 
colord and colord-gtk packages, and I noticed some anomalous copyright 
lying around.

colord:
lib/colorhug: GPL, but maybe that's intentional

lib/dtp94, lib/huey, lib/munki: GPL, except for the header file 
(dtp94.h, huey.h, munki.h). That looks like a mistake?

contrib/session-helper: header is LGPL, the rest of the library is GPL?

colord-gtk:
libcolord-gtk: everything's LGPL, except for cd-sample-widget.{c,h}, 
which is GPL.

Some of this is probably intentional, but some probably isn't.