Update version info to 2.4.1

Ensure all relevant files show version as 2.4.1

README

@@ -50,6 +50,11 @@ Simplified GUI. Addition of "render" functions provides an API for
 glabels. Corrections to 4-state codes. Simplification in QR code. Added
 --dump option and support for reading from stdin.
 
+Version 2.4.1:
+Contains bugfixes for Data Matrix and QR Code. Add option to produce multiple
+files from the command line. Add option to change font size in PNG images.
+Tidy up information for creating Debian packages and for compiling on MS
+Visual Studio. Correct bug preventing compilation without PNG support.
 
 CONTACT ME
 ----------

frontend_qt4/mainwindow.cpp

@@ -163,9 +163,9 @@ bool MainWindow::save()
 void MainWindow::about()
 {
 	QMessageBox::about(this, tr("About Zint"),
-			   tr("<h2>Zint Barcode Studio 2.4</h2>"
+			   tr("<h2>Zint Barcode Studio 2.4.1</h2>"
 					   "<p>A free barcode generator"
-					   "<p>Visit the <a href=\"http://www.zint.org.uk\">Zint Project Homepage</a> for more information."
+					   "<p>Visit the Zint Project Homepage at www.zint.org.uk for more information."
 					   "<p>Copyright &copy; 2010 Robin Stuart.<br>"
 					   "Qt4 code by BogDan Vatra, MS Windows port by \"tgotic\".<br>"
 					   "With thanks to Norbert Szab&oacute;, and Robert Elliott."