Relicense to LGPL 2.1 and thus update license and headers

This relicensing was requested and approved by all authors by E-Mail.

1 files changed, 479 insertions, 651 deletions

diff --git a/LICENCE b/LICENCE
index 94a9ed0..f166cc5 100644
--- a/LICENCE
+++ b/LICENCE
@@ -1,674 +1,502 @@
-                    GNU GENERAL PUBLIC LICENSE
-                       Version 3, 29 June 2007
+                  GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 2.1, February 1999
 
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Copyright (C) 1991, 1999 Free Software Foundation, Inc.
+ 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
+[This is the first released version of the Lesser GPL.  It also counts
+ as the successor of the GNU Library Public License, version 2, hence
+ the version number 2.1.]
+
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\ No newline at end of file