Linux bug fix plus running inside JDistro

There was a refreshing bug on Linux/jdk1.4 on SoundModulePanel.java which should be fixed now.

Also fixed GUIProperties.java to include getProperty("user.dir") in the path string, which makes Javasynth work inside JDistro - and probably helps on other environments too.

The fixes are included only in the CVS at the moment. Thanks to Desnoix Guillaume for these fixes.