enhancement - changed to concatenated matrix for the case of multiple points

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@8682 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0
enhancement - added functionality for eloreta

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@8683 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0