The TracChangeset module shouldn't assume the authorizer is a !SubversionAuthorizer; use the `repos.authz` instead. 
The TracChangeset module shouldn't assume the authorizer is a !SubversionAuthorizer; use the `repos.authz` instead. 

This also eliminates the incompatibilities with the changes introduced by r4200 to its `__init__` method.


git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@4206 af82e41b-90c4-0310-8c96-b1721e28e2e2

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