updated license text with current GPL 2.0 text

updated license text with current GPL 2.0 text

NOTE: THIS IS NOT A SEMANTICALLY IMPORTANT CHANGE TO EVERGREEN'S LICENSE.

Updated LICENSE.txt by pulling the current GPL 2.0 text
directly from http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt

The changes are purely textual, and consist solely of:

* updating the FSF's mailing address
* changing references to the "GNU Library General Public License"
  to "GNU Lesser General Public License", per the FSF's current
  (and long-standing) practice
* whitespace changes

REPEAT: THIS IS NOT A RELICENSING

git-svn-id: svn://svn.open-ils.org/ILS/trunk@16634 dcc99617-32d9-48b4-a31d-7c20da2025e4