Release 1.6.0 version bump

Author: graemeg

project.xml

@@ -4,7 +4,7 @@
   <!-- This project builds itself! -->
 
   <name>PasBuild</name>
-  <version>1.6.0-dev</version>
+  <version>1.6.0</version>
   <author>Graeme Geldenhuys</author>
   <license>BSD-3-Clause</license>