On the 'move-tracking-2' branch: Make 'svnmover merge' interpret the
three arguments consistently as relative to the given base URL.

* BRANCH-README
  Remove the suggestion to do something slightly different.

* subversion/svnmover/svnmover.c
  (execute): Don't re-interpret the first and third arguments of 'merge'.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/move-tracking-2@1639595 13f79535-47bb-0310-9956-ffa450edef68