restructuring - renamed the edgeonly option into surfaceonly, because "edge" is confusing with the line segments that connect vertices and the options like edgecolor etc.


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@8624 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0