Bug 37197 Basepath for relative pathes in JAR-exporter
The basepath for the JAR-exporter is the eclipse-install-directory. I prefer it to be the root of the project (the description is saved in), so that relative pathes end inside the project. Now: <jardesc> <jar path="workspace/projectdir/jar.jar"/> Desired: <jardesc> <jar path="jar.jar"/> Reason: To make the jardesc-files portable for shared projects
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarPackageWizardPage.java
fJarPackage.setElements(getSelectedElements());
			fJarPackage.setExportClassFiles(settings.getBoolean(STORE_EXPORT_CLASS_FILES));
			fJarPackage.setExportJavaFiles(settings.getBoolean(STORE_EXPORT_JAVA_FILES));
			
			fJarPackage.setCompress(settings.getBoolean(STORE_COMPRESS));
			fJarPackage.setOverwrite(settings.getBoolean(STORE_OVERWRITE));
						
			
			String[] directoryNames= settings.getArray(STORE_DESTINATION_NAMES);
			if (directoryNames == null)
				return; 
			fJarPackage.setJarLocation(new Path(directoryNames[0]));
		}
	}
	/**
	 *	Stores the widget values in the JAR package.
	 */
	protected void updateModel() {
		if (getControl() == null)
			return;
		
		
		fJarPackage.setElements(getSelectedElements());
		fJarPackage.setExportClassFiles(fExportClassFilesCheckbox.getSelection());
		fJarPackage.setExportJavaFiles(fExportJavaFilesCheckbox.getSelection());
		
		String comboText= fDestinationNamesCombo.getText();
		IPath path= new Path(comboText);
		if (!new File(comboText).isAbsolute())