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

frontend_qt4/grpDM.ui

@@ -207,7 +207,6 @@
          <string>16 x 48</string>
         </property>
        </item>
-       <!-- DMRE sizes commented out
        <item>
         <property name="text">
          <string>8 x 48</string>
@@ -268,7 +267,6 @@
          <string>26 x 64</string>
         </property>
        </item>
-      -->
       </widget>
      </item>
     </layout>
@@ -283,6 +281,16 @@
      </property>
     </widget>
    </item>
+   <item>
+    <widget class="QCheckBox" name="chkDMRE">
+     <property name="text">
+      <string>Allow DMRE in Automatic Mode</string>
+     </property>
+     <property name="checked">
+      <bool>false</bool>
+     </property>
+    </widget>
+   </item>
    <item>
     <spacer name="verticalSpacer">
      <property name="orientation">