enhancement - better deal with volume conduction model with multiple boundaries, remove unit from vol.bnd.unit and put it at the top level


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@8807 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0
automatically synchronized identical files to revision 8807

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@8808 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0