bugfix: ft_appenddata now uses isequaln() to check whether trialinfo/sampleinfo are consistent across input arguments, this ensures that trialinfos with nans in them are properly treated


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9627 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0