On the 1.8.x-r1481625 branch, merge r1481625, r1481627, r1481628,
r1481631 and r1481632 from trunk, with one tweak:

* subversion/include/svn_path.h
  (svn_path_illegal_path_escape): Mark as @since 1.8.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x-r1481625@1481638 13f79535-47bb-0310-9956-ffa450edef68