On the fsfs-format7 branch:  add full support for UTF-8 file names as TODO

* BRANCHES-README
  (TODO): * add section about control chars in file names.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-format7@1467768 13f79535-47bb-0310-9956-ffa450edef68