Copyright-holder and year information is extracted from git log.
git history begins in 2005. So (C) from 1998..2005 is lost. Also some
(C) assignment of commits where the committer didn't use --author.
Fixes#4364.
I havn't fully tested every single dialog and window (heck, I don't even know
how to get at half of them), and there may be some packing niggles, but this is
the bulk of the work. The Gnome 3 kiddies can close their dialogs now, anyway
:)
git-svn-id: svn://localhost/ardour2/branches/3.0@10699 d708f5d6-7413-0410-9779-e7cbd77b26cf
