small temporary regression: we cannot export ft_datatype_raw with multiple trials to fiff epochs. It'll soon be fixed when we have the low-level functions to write epochs to fiff.

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9189 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0