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plot.ts(x,y) could use wrong default labels; fixed thanks to Antonio, Fabio di Narzo.
reshape() got column names out of sync with contents in some cases; found by Antonio, Fabio Di Narzo.
ar(x) for short 'x' (i.e. length <= 10) could fail because the default 'order.max' was >= length(x) which is non-sensical.