- PDF417/MICROPDF417: use latch not ps shift for padding when

spanning Text segments to avoid affecting 1st char of 2nd segment
- PDF417/MICROPDF417: add optimized encoding, FAST_MODE for
  previous scheme; formatting changes
- common.c/h: add `cnt_digits()`, comments in include and make more
  consistent, minor code fiddling
- DOTCODE: replace `dc_n_digits()` with new `cnt_digits()`
- test_qr: fix `test_qr_perf()`
- composite: minor code fiddling
- library: debug dump HIBC-processed input
- BWIPP: update to latest

backend/dmatrix.c

@@ -758,7 +758,9 @@ static int dm_getEndMode(struct zint_symbol *symbol, const unsigned char *source
     return mode;
 }
 
-/*#define DM_TRACE*/
+#if 0
+#define DM_TRACE
+#endif
 #include "dmatrix_trace.h"
 
 /* Return number of C40/TEXT codewords needed to encode characters in full batches of 3 (or less if EOD).