docs: corrections to FSF license files, and postal address

docs: corrections to FSF license files, and postal address

The COPYING and Documentation/licenses/COPYING* files are being
replaced by files from GNU web site.

http://www.gnu.org/licenses/gpl-2.0.txt
http://www.gnu.org/licenses/lgpl-2.1.txt

Postal addresses to FSF in other files are updated to match with the
address in license files.

Reference: http://lists.gnu.org/archive/html/freefont-announce/2005-04/msg00001.html
Signed-off-by: Sami Kerola <kerolasa@iki.fi>