Update FSF mailing address

Several files in the tree contain a mailing address for the Free Software Foundation that is no longer correct.

The new address is:
Free Software Foundation
51 Franklin Street, Fifth Floor
Boston, MA 02110-1301
USA

Source: http://www.fsf.org/about/contact/

This pull request updates the the FSF's mailing address in each header.

For the copies of the GPL and LGPL files, I've updated these to verbatim copies of https://www.gnu.org/licenses/gpl-2.0.txt and https://www.gnu.org/licenses/lgpl-2.1.txt.