On the invoke-diff-cmd-feature branch: Update BRANCH-README file.
Trivial white space changes to assorted files.

* BRANCH-README: Update general shape and rework all log messages.
  Add new diff file.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/invoke-diff-cmd-feature@1542741 13f79535-47bb-0310-9956-ffa450edef68