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/ui/jarpackager/JarPackageData.java
* Error handling
	 */
	private boolean fExportErrors;
	private boolean fExportWarnings;
	
	
	private IManifestProvider fManifestProvider;
	
	public JarPackageData() {
		setExportClassFiles(true);
		setUseSourceFolderHierarchy(false);
		setCompress(true);
		setSaveDescription(false);
		setJarLocation(new Path("")); 
		setDescriptionLocation(new Path("")); 
		setUsesManifest(true);
		setGenerateManifest(true);
		setReuseManifest(false);
		setSaveManifest(false);
		setManifestLocation(new Path("")); 
		setExportErrors(true);
		setExportWarnings(true);		
		setBuildIfNeeded(true);
	}
	
	
	/**
	 * Tells whether the JAR is compressed or not.
	 * 
	 * @return	<code>true</code> if the JAR is compressed