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

zint.spec

@@ -1,5 +1,5 @@
 Name:      zint
-Version:   2.4.4
+Version:   2.5.0
 Release:   2%{?dist}
 Summary:   A barcode generator and library
 License:   GPLv3+