Add explicit license, using GPL version 3. No code changes in commit.

git-archive-all.sh

@@ -13,6 +13,26 @@
 #                  cd $GIT_DIR; git-archive-all.sh
 #
 #              where $GIT_DIR is the root of your git superproject.
+#
+# License:     GPL3
+#
+###############################################################################
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+###############################################################################
 
 # DEBUGGING
 set -e