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
* 
	 * @return an array of leaf objects
	 */
	public Object[] getElements() {
		if (fElements == null)
			setElements(new Object[0]);
		return fElements;
	}
	/**
	 * Set the elements which will be exported.
	 * 
	 * These elements are leaf objects e.g. <code>IFile</code>.
	 * and not containers.
	 * 
	 * @param elements	an array with leaf objects
	 */
	public void setElements(Object[] elements) {
		fElements= elements;
	}
	/**
	 * Returns the JAR's comment.
	 * 
	 * @return the comment string or <code>null</code>
	 * 			if the JAR does not contain a comment
	 */
	public String getComment() {
		return fComment;
	}
	/**
	 * Sets the JAR's comment.