Improve the support of Subversion:
 1)Add svn python binding librarys: svn-win32-1.6.15_py_2.7.zip. see
http://trac.edgewall.org/wiki/TracSubversion for detail.(ref:
http://www.lejordet.com/2009/03/compiling-subversion-python-bindings-on-windows/);
 2)Add the test svn repository as a build-in part of PortableTrac:
data/svn-testcase .
 3)Modify trac env restore scripts(do_restore.bat), to run the hook
after restore trac.sql to sqlite DB ---- Just for the svn-testcase
"portable".