enhancement - added cfg.viewmode=ortho|surface to allow fiducials to be clicked on head surface (see http://bugzilla.fcdonders.nl/show_bug.cgi?id=2707). Also overhauled the general documentation, removing the already obsolete landmark method (which is now a special case of fiducial).


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9928 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0