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Extend "--plot=data" mode

Make complete raw filter information available for use by external
programs with --plot=data.

For FIR filters (lsx_plot_fir(), already supports --plot=data), add
the sample rate to the output.

For IIR filters (lsx_biquad_start()), introduce --plot=data and output
filter coefficients as well as sample rate.

--- a/src/biquad.c

+++ b/src/biquad.c

@@ -118,6 +118,25 @@

       , p->b0, p->b1, p->b2, p->a1, p->a2);

     return SOX_EOF;

   }

+  if (effp->global_info->plot == sox_plot_data) {

+    printf("# SoX effect: %s gain=%g frequency=%g %s=%g (rate=%g)\n"

+      "# IIR filter\n"

+      "# rate: %g\n"

+      "# name: b\n"

+      "# type: matrix\n"

+      "# rows: 3\n"

+      "# columns: 1\n"

+      "%24.16e\n%24.16e\n%24.16e\n"

+      "# name: a\n"

+      "# type: matrix\n"

+      "# rows: 3\n"

+      "# columns: 1\n"

+      "%24.16e\n%24.16e\n%24.16e\n"

+      , effp->handler.name, p->gain, p->fc, width_str[p->width_type], p->width

+      , effp->in_signal.rate, effp->in_signal.rate

+      , p->b0, p->b1, p->b2, 1. /* a0 */, p->a1, p->a2);

+    return SOX_EOF;

+  }

   return SOX_SUCCESS;

 }

--- a/src/effects_i_dsp.c

+++ b/src/effects_i_dsp.c

@@ -454,10 +454,12 @@

   }

   else if (type == sox_plot_data) {

     printf("# %s\n"

+        "# FIR filter\n"

+        "# rate: %g\n"

         "# name: b\n"

         "# type: matrix\n"

         "# rows: %i\n"

-        "# columns: 1\n", title, num_points);

+        "# columns: 1\n", title, rate, num_points);

     for (i = 0; i < num_points; ++i)

       printf("%24.16e\n", h[i]);

   }