bugfix - the problem with single precision appeared again, see bug http://bugzilla.fcdonders.nl/show_bug.cgi?id=2474 . Had to chase it through all the functions in SPM in FT and finally it came down to this.

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9251 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0