After converting the S documentation files to Rd format, replace `iris'
by `iris3' e.g. using
   perl -pi -e s/iris/iris3/g *.Rd
# and add `data(iris3)' at the beginning of each example which uses the
# (S version of the) iris data set.  [OBSOLETE, now in zzz.R.]

In nnet.c, replace all occurences of `float' by `double'.

In knn.q and lvq.q, change
  single -> double
  unclass -> codes
  as.integer(codebk$cl) -> codes(codebk$cl)
(the latter two need unchanging in future versions of 0.62).

Add R/zzz.R to load class.so and the iris3 data set as possible.
