o BUG FIX: commandArgs(excludeReserved=TRUE) failed to drop reserved
  arguments of type --<key>=<value>, e.g. --encoding=ASCII.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r-dots@2003 edb9625f-4e0d-4859-8d74-9fd3b1da38cb