Added flipping option to trigger reading.
Added warning if old neuromag_v2 eventformat is used.
Added error specifier to v2 error
ft_trialfun now exits if ft_read_event fails and rethrows the error.
Added warning if users use cfg.flip option
resolved conflicts

Merge branch 'ft_read_event_flip' into fieldtrip_cimec

Conflicts:
	trialfun/ft_trialfun_general.m