enhancement - added test on event.sample between mff_v1 and v2. This presently fails, indicating a problem with the code. See bug 1407

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9223 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0