Config files are not user-specific

If Workcraft is installed system-wide, then there is a problem with its config files. If Workcraft has write access to its config directory, then different users may overwrite each other's configs. If the directory is read-only, then the following exception is issued on exit:

java.io.FileNotFoundException: ./config/uilayout.xml (Permission denied)
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(Unknown Source)
        at java.io.FileOutputStream.<init>(Unknown Source)
        at org.workcraft.gui.MainWindow.saveDockingLayout(MainWindow.java:649)
        at org.workcraft.gui.MainWindow.shutdown(MainWindow.java:712)
        at org.workcraft.Framework.shutdownGUI(Framework.java:456)
        at org.workcraft.Console.main(Console.java:160)

Now in console mode.
Shutting down...

java.io.FileNotFoundException: config/config.xml (Permission denied)
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(Unknown Source)
        at java.io.FileOutputStream.<init>(Unknown Source)
        at org.workcraft.Config.save(Config.java:284)
        at org.workcraft.Framework.saveConfig(Framework.java:240)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:161)
        at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:247)
        at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:66)
        at org.mozilla.javascript.gen.c1._c15(<string>:61)
        at org.mozilla.javascript.gen.c1.call(<string>)
        at org.mozilla.javascript.optimizer.OptRuntime.callName0(OptRuntime.java:108)
        at org.mozilla.javascript.gen.c4._c0(<string>:3)
        at org.mozilla.javascript.gen.c4.call(<string>)
        at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:398)
        at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3065)
        at org.mozilla.javascript.gen.c4.call(<string>)
        at org.mozilla.javascript.gen.c4.exec(<string>)
        at org.mozilla.javascript.Context.evaluateString(Context.java:1104)
        at org.workcraft.Framework$ExecuteScriptAction.run(Framework.java:110)
        at org.mozilla.javascript.Context.call(Context.java:515)
        at org.mozilla.javascript.ContextFactory.call(ContextFactory.java:507)
        at org.workcraft.Framework.doContextAction(Framework.java:383)
        at org.workcraft.Framework.execJavaScript(Framework.java:377)
        at org.workcraft.Framework.execJavaScript(Framework.java:369)
        at org.workcraft.Console.main(Console.java:173)

The best solution is to keep all the configs in the user home directories, e.g. under $HOME/.config/workcraft/ path.