maint: add copyright notices

* HACKING: Add copyright notice.
* tests/test-lib.sh: Likewise.

HACKING

@@ -408,3 +408,13 @@ to generate HTML coverage reports.  Follow these steps:
 
 Then just open the index.html file (in the generated lcov-html directory)
 in your favorite web browser.
+
+========================================================================
+Copyright (C) 2009 Free Software Foundation, Inc.
+
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no
+Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
+Texts.  A copy of the license is included in the ``GNU Free
+Documentation License'' file as part of this distribution.

tests/test-lib.sh

@@ -1,5 +1,20 @@
 # source this file; set up for tests
 
+# Copyright (C) 2009 Free Software Foundation, Inc.
+
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+
 # Skip this test if the shell lacks support for functions.
 unset function_test
 eval 'function_test() { return 11; }; function_test'