bugfix - Guillaume's changes to make the code for Biosemi work with both old and new Matlab versions. This uses try... catch, you can replace with version detection if you want. The 'old' versions are R2012a and before.

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9823 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0