enhancement - some cleanups to the local workspace in relation to saving it to a mat file upon error, all temporary variables in the ft_preamble_xxx and ft_postamble_xxx scripts shoudl be cleared after use. 


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9746 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0