fix build

build.xml

@@ -75,7 +75,7 @@
     <target name="-post-jar">
     <jar jarfile="dist/LibLaserCutWithDeps.jar">
         <zipfileset src="${dist.jar}" excludes="META-INF/*" />
-        <zipfileset src="lib/commons-net-3.0.1.jar" excludes="META-INF/*" />
+        <zipfileset src="lib/commons-net-3.1.jar" excludes="META-INF/*" />
     </jar>
 </target>
 </project>

nbproject/project.properties

@@ -26,11 +26,8 @@ dist.jar=${dist.dir}/LibLaserCut.jar
 dist.javadoc.dir=${dist.dir}/javadoc
 endorsed.classpath=
 excludes=
-file.reference.commons-net-3.0.1.jar=lib/commons-net-3.0.1.jar
 includes=**
 jar.compress=false
-javac.classpath=\
-    ${file.reference.commons-net-3.0.1.jar}
 # Space-separated list of extra javac options
 javac.compilerargs=
 javac.deprecation=false