enhancement - added support for writing binary ply files, added support for reading ascii and binary ply files. Added test script. See http://bugzilla.fcdonders.nl/show_bug.cgi?id=2370


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@8749 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0