enhancement - extended test_ft_plot_mesh with the test script that is attached to http://bugzilla.fcdonders.nl/show_bug.cgi?id=1833


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9701 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0