enhancement - incorporated changes so that ft_selectdata_new resembles more ft_selectdata_old, as well as incorporation of 'all' and [] as selection criteria

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@8665 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0