%SETFEATSIZE Set featsize of datafile
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% A = SETFEATSIZE(A,FEATSIZE)
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% INPUT
% A - Datafile
% FEATSIZE - Desired feature size,
% Default: compute from first object in A
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% OUTPUT
% A - Datafile
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% DESCRIPTION
% If A is a dataset, its featsize is set. The featsize of a datafile
% is unclear as objects may have different sizes. For that reason
% the feature sizes of datafiles might better be set to 0, unless the
% objects are images of the same size.
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% SEE ALSO (<a href="http://37steps.com/prtools">PRTools Guide</a>)
% DATAFILES