Run svn diff with -x -p by default (because that is what is useful for source code), and allow the user to customise these options.
Run svn diff with -x -p by default (because that is what is useful for
source code), and allow the user to customise these options.

* contrib/client-side/emacs/dsvn.el
  (svn-diff-args): New defcustom.
  (svn-diff, svn-log-diff, svn-diff-file): Use svn-diff-args.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1369014 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion