plotyy.m: Fix error when called repeatedly (bug #53461). * scripts/plot/draw/plotyy.m: Allow first argument to be a 2-vector with both plotyy axes handles from a previous call. (__plotyy__): Reset secondary axes so that it doesn't accumulate more and more listeners. (deleteplotyy): Do not delete sister axes if called through "plotyy" (most likely via "reset"). * newplot.m: Do not delete plotyy axes when called through "plotyy".

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