JDK6 adjustment: changed javac source and target from 1.7 to 1.6

Author: tobium

java/nbproject/project.properties

@@ -39,8 +39,8 @@ javac.compilerargs=
 javac.deprecation=false
 javac.processorpath=\
     ${javac.classpath}
-javac.source=1.7
-javac.target=1.7
+javac.source=1.6
+javac.target=1.6
 javac.test.classpath=\
     ${javac.classpath}:\
     ${build.classes.dir}:\