allow impute function to set extras attribute #497
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Allow things like
makeMBOControl( impute.y.fun = function(x, y, opt.path, ...) { structure(-log(1/4), extras = list(metainfo = 2)) # log loss of dumbest possible prediction for 4 classes (i.e. nucleotide prediction) }, ... )otherwise, setting extras attribute in the actual function gives an error whenever a value is imputed, since opt.path doesn't allow points to have missing "extra(s)" for individual points.