enhancement - correctly deal with left-handed voxel coordinate system in the case of RAS-type axis orientations

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9058 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0
automatically synchronized identical files to revision 9058

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9059 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0