Use `base_url` when computing absolute URL of redirection (from a patch by cmlenz, on #2553)
Use `base_url` when computing absolute URL of redirection (from a patch by cmlenz, on #2553)

git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@2820 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac