enhancement - renamed the checkmaxshield option into checkmaxfilter, also added it to ft_read_data (since that calls ft_read_header)


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@10015 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0