Add Data Matrix Rectangular Extension (DMRE) in regular distribution

- add define "DM_DMRE	101" to zint.h as option_3 value
- add option "-dmre" to command line
- add ckeckbutton "Activate DMRE in automatic mode" to qzint
- make dmatrix.c/dmatrix.h aware of option_3 value DM_DMRE and include DMRE in automatic mode
- Use version 2.5 everywere (as already started by Robin)
- common test case for DMRE in automatic mode is numeric input data with 48 digits, which should lead to a symbol of size 8x64

backend/dmatrix.c

@@ -1178,11 +1178,18 @@ int data_matrix_200(struct zint_symbol *symbol, unsigned char source[], int leng
         }
     }
 
-    /* Skip rectangular symbols in square only mode */
-    while (symbol->option_3 == DM_SQUARE && matrixH[calcsize] != matrixW[calcsize]) {
-        calcsize++;
-    }
-
+    if (symbol->option_3 == DM_SQUARE) {
+        /* Skip rectangular symbols in square only mode */
+        while (matrixH[calcsize] != matrixW[calcsize]) {
+            calcsize++;
+        }
+    } else if (symbol->option_3 != DM_DMRE) {
+        /* Skip DMRE symbols */
+        while (isDMRE[calcsize]) {
+            calcsize++;
+        }
+    }
+
     symbolsize = optionsize;
     if (calcsize > optionsize) {
         symbolsize = calcsize;