tabread4~ needs at least 4 samples to interpolate;
this patch adds guards in order to not access out-of-bound indices in the table,
in case the table is smaller than 4 samples.
commit e667894370ec22bc1d1d844443d90f1a76adc03e

This reverts commit 16973649, reversing
changes made to 15094e4c.

tabread4~ needs at least 4 samples to interpolate;
this patch adds guards in order to not access out-of-bound indices in the table,
in case the table is smaller than 4 samples.
commit e667894370ec22bc1d1d844443d90f1a76adc03e

*ported fixes for crasher when sending a "dsp" message to tilde objects.  Backported from Pd Vanilla commits [8019b5] and [5769c5]