Add a clarifying early-out when retrieving branch names:
Add a clarifying early-out when retrieving branch names:

* tools/cvs2svn/cvs2svn.py
  (CollectData.get_branch_name): Return None right away if handed a
    trunk revision.
  (CollectData.set_revision_info): Comment out some in-progress code.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion