check-code: drop the 'isdisjoint' ban 'isdisjoint' is available in Python 2.6. The new lowest supported version.

check-code: fix the error message about 'class foo():' Using 'classs foo():' result in old style object instead of new style object. We do not want old style object so this check is unrelated to 2.4.

check-code: remove the check for os.path.relpath This is available in Python2.6 the new default supported release.

patch: remove duplicated import of cStringIO It is already imported a couple of line above.

check-commit: print limit when user has a too-long summary

paper: show branch/tags/bookmarks when blaming (issue3559)

paper: show branch/tags/bookmarks when comparing (issue3559)

paper: show branch/tags/bookmarks when diffing (issue3559)

paper: show branch/tags/bookmarks when viewing (issue3559)

paper: show branch/tags/bookmarks when browsing (issue3559) Browse (or manifest) action allows browsing the directory structure at some specified revision. In gitweb and monoblue styles, the revision header already has branch/tag/bookmark information for the revision, but in paper style this header was only showing tags. This patch adds branches and bookmarks. Branch name needs to be obtained in this special way to be consistent with regular changeset page, where in paper style default branch is never shown.