trigshift is false by default, should be (integer) 0

[robertoostenveld]

Marc triggered (no pun intended) me to look into the code with #2030 and I noticed

fieldtrip/fileio/private/read_trigger.m

Line 45 in c607aec

trigshift = ft_getopt(varargin, 'trigshift', false); % causes the value of the trigger to be obtained from a sample that is shifted N samples away from the actual flank

which makes the default false rather than 0. I tested the code, false+1 evaluates to 1, just like 0+1, so it does not seem have to have any serious effect.

Nevertheless, the default should be an integer 0.