Add .nrows(), .ncols() and old names .rows(), .cols() are now deprecated #701
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.rows()/.cols() are renamed to nrows/ncols respectively, to make space
for putting the row iterable/ndproducer in this place instead.
The deprecated methods will be removed in the release after they were
first deprecated.
These new names and the deprecations are the first step towards renaming genrows/gencolumns #698