Comment 4 for bug 190913

@Edwin Grubbs:
The "+" options are necessary. It's a big difference if code is released as GPLv2 or GPLv2+.
In the latter case I can convert the code to GPLv3 and use it in another GPLv3 program.
If the code I want to use is licensed under GPLv2 I can't do that. The same situation will
arise if GPLv4 is published and I want to use GPLv3 or GPLv3+ code.

@Jordan Mantha:
I don't think we should make another copy of the license compatibility matrix like Fedora did.
Just point the Launchpad users to the original one at <http://www.fsf.org/licensing/licenses/gpl-faq.html#AllCompatibility>.