Elm was lgpl3, COPYING was lgpl3, docs say lgpl3. So fix everything to be v3.
Also fix the COPING for Lesser: we must include gpl (in COPYING) AND lgpl (in COPYING.LESSER).
Has two loggers: efl and efl.eo.
To test, add handlers, formatters etc. and change levels using
normal Python logging utilities. The test messages come from
efl.eo init and class registration.