Rename directory "licenses" to "licenses.d" for those filesystems unable to handle lower/upper case.

Update COPYING accordingly.

COPYING

@@ -3,19 +3,19 @@ the following terms.
 
 - Files in docs/ are available under the Creative Commons Attribution, Share
   Alike (by-sa), v2.5, to be found there:
-    licenses/by-sa/deed.en     (human-readable summary)
-    licenses/by-sa/legalcode   (legal code, the full license)
+    licenses.d/by-sa/deed.en     (human-readable summary)
+    licenses.d/by-sa/legalcode   (legal code, the full license)
     
 - Files found in patches/uClibc/*/ are available under the GNU Lesser General
-  Public License (LGPL), v2.1, to be found here:
-    licenses/lgpl.txt
+  Public License (LGPL), v2.1, to be found there:
+    licenses.d/lgpl.txt
 
 - Files found in patches/glibc/*/ are available under the GNU Lesser General
   Public License (LGPL), v2.1, to be found there:
-    licenses/lgpl.txt
+    licenses.d/lgpl.txt
 
 - Other files not covered by the above licenses, and not covered by an
   individual license specified in the file itself, or an accompanying file,
   are available under the GNU General Public License (GPL), v2, to be found
   here:
-    licenses/gpl.txt
+    licenses.d/gpl.txt