Restore double-depth try/finally, for Python 2.4 compatability. Thanks, @delallea.

setup.py

@@ -110,6 +110,7 @@ if not release:
     FULL_VERSION += '.dev-' + GIT_REVISION
 
     a = open(filename, 'w')
+    try:
         try:
             a.write(cnt % {'version': VERSION,
                            'full_version': FULL_VERSION,