[FieldTrip] change in filter order for 'fir' type

[Johanna Zumer]

Dear FieldTrip users,

As of tonight's FT version, the filter order for the 'fir' filter will
change.   It used to be set to 25 by default, but now will be a 'smarter'
value based on your data and filter requests.   You can still override this
by setting, for example, cfg.bpfiltord=25; in order to obtain equivalent
results as before if you typically used the default.

By default, filtering in FT uses the Butterworth filter ('butter') instead
of 'fir'; this default filter-type has not changed, and the filter-order
for 'butter' has not changed either.

Best,
Johanna
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