Save the options and restore them on.exit to make this test indempotent.  This might be responsible for some
unit test failures if R CMD CHECK now runs the same testSuite twice, which I don't think it does.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@929 edb9625f-4e0d-4859-8d74-9fd3b1da38cb