* ADD docs/change-license-emails.txt, which includes email exchanges between
myself and intrigeri, including links to Debian and LEAP mailing lists with
arguments for and against using AGPL for a library.
* CHANGE license header for all files.
* CHANGE LICENSE file and gnupg/copyright.py to use GPLv3+ text.
GPG signature timestamps are considered UTC, this may cause times to be off
by delta > 1000 in def test_signature_string_verification because it
incorrectly gave gmtime() as an argument to mktime().
Python 2 and 3 docs both say that mktime should have a struct_time argument
"which expresses the time in local time, not UTC". So the test is now using
time.localtime() instead of time.gmtime()
Mikael Nordfeldth
Isis Lovecruft