hg 1.6 compat

[Christian Boos]

Seen here on [pysqlite:wiki pysqlite.org-mirror]:

Traceback (most recent call last):
  File "build/bdist.linux-x86_64/egg/trac/web/main.py", line 513, in _dispatch_request
    dispatcher.dispatch(req)
  File "build/bdist.linux-x86_64/egg/trac/web/main.py", line 235, in dispatch
    resp = chosen_handler.process_request(req)
  File "build/bdist.linux-x86_64/egg/trac/timeline/web_ui.py", line 142, in process_request
    available_filters += event_provider.get_timeline_filters(req) or []
  File "build/bdist.linux-x86_64/egg/trac/versioncontrol/web_ui/changeset.py", line 863, in get_timeline_filters
    repositories = rm.get_real_repositories()
  File "build/bdist.linux-x86_64/egg/trac/versioncontrol/api.py", line 588, in get_real_repositories
    repos = self.get_repository(reponame)
  File "build/bdist.linux-x86_64/egg/trac/versioncontrol/api.py", line 526, in get_repository
    repos = connector.get_repository(rtype, rdir, repoinfo.copy())
  File "build/bdist.linux-x86_64/egg/tracext/hg/backend.py", line 279, in get_repository
    repos = MercurialRepository(dir, options, self.log, self.ui)
  File "build/bdist.linux-x86_64/egg/tracext/hg/backend.py", line 369, in __init__
    self.repo = hg.repository(ui=ui, path=path)
  File "usr/local/lib/python2.5/site-packages/mercurial/hg.py", line 94, in repository
  File "usr/local/lib/python2.5/site-packages/mercurial/localrepo.py", line 1870, in instance
  File "usr/local/lib/python2.5/site-packages/mercurial/localrepo.py", line 37, in __init__
  File "usr/local/lib/python2.5/site-packages/mercurial/ui.py", line 73, in readconfig
  File "usr/local/lib/python2.5/site-packages/mercurial/ui.py", line 60, in _is_trusted
  File "usr/local/lib/python2.5/site-packages/mercurial/ui.py", line 505, in warn
TypeError: write_err() got an unexpected keyword argument 'label'

[Christian Boos]

Fixed in r9943:9944.