Numerous little changes to spandsp that haven't been pushed to Freeswitch for a

while. The only big changes are a majorly rewritten V.42 and V.42bis which are
now basically functional.

libs/spandsp/src/plc.c

@@ -165,10 +165,8 @@ SPAN_DECLARE(int) plc_fillin(plc_state_t *s, int16_t amp[], int len)
     float old_weight;
     float new_weight;
     float gain;
-    //int16_t *orig_amp;
     int orig_len;
 
-    //orig_amp = amp;
     orig_len = len;
     if (s->missing_samples == 0)
     {