Comment 5 for bug 1125702

Hmm, looks like yesterday folks went through and clarified the licensing and boilerplate on source code.

Looks like pretty much all the source code is LGPL, with main.cpp being the only GPL-3 bit.

I've left debian/copyright as claiming LGPL-3 and just fixed up the license title to match. I'm guessing this file should also say something about the GPL-3 bits, but will leave that to someone better educated about the licensing breakdown of the codebase.