- CODABLOCKF: fix misencodation of extended ASCII 0xB0-0xB9 when

followed by digit (ignore 2nd byte of FNC4 when categorizing
  Code C characters)
- New `ZBarcode_Cap()` flag `ZINT_CAP_BINDABLE`, differentiated
  from `ZINT_CAP_STACKABLE`, and new Qt Backend method
  `isBindable()`
- CLI: fix `separator` check to use new `ZINT_CAP_BINDABLE` instead
  of `ZINT_CAP_STACKABLE`
- ZBarcode_Cap: add missing symbologies to `ZINT_CAP_BINDABLE` (was
  `ZINT_CAP_STACKABLE`)
- DOTCODE: pad rows if given number of columns instead of failing
  if rows below min (5)
- DBAR/composites: ensure stacked symbologies and composites are
  not stacked (set `symbol->rows` to 0)
- test suite: move `test_perf` routines into single test
  "test_perf";
  new "test_random" (based on "test_bwipp") to test various
  symbologies with random binary - discovered CODABLOCKF bug;
  expand "test_bwipp"
manual: Feeback: mention AZTEC -1 meaning min & MICROPDF417:
  doc new `ZINT_CAP_BINDABLE`
general: various code fiddlings and re-formattings

backend/zint.h

@@ -33,7 +33,10 @@
 /*
  * Version: 2.15.0.9 (dev) (see "zintconfig.h")
  *
- * For documentation, see "../docs/manual.txt" or "../docs/manual.html" or online at
+ * For documentation, see "../docs/manual.txt" or "../docs/manual.html" or the
+ * PDF manual for 2.15.0 at
+ * https://sourceforge.net/projects/zint/files/zint/2.15.0/manual.pdf/download
+ * or online at
  * https://zint.org.uk/manual/
  */
 
@@ -366,6 +369,7 @@ extern "C" {
 #define ZINT_CAP_MASK               0x0800  /* Is mask selectable? */
 #define ZINT_CAP_STRUCTAPP          0x1000  /* Supports Structured Append? */
 #define ZINT_CAP_COMPLIANT_HEIGHT   0x2000  /* Has compliant height? */
+#define ZINT_CAP_BINDABLE           0x4000  /* Can set row separators? */
 
 /* The largest amount of data that can be encoded is 4350 4-byte UTF-8 chars in Han Xin Code */
 #define ZINT_MAX_DATA_LEN       17400