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	<code>true</code> if the manifest must be saved
	 * @see #getManifestLocation()
	 */
	public boolean isManifestSaved() {
		return fSaveManifest;
	}
	/**
	 * Set whether the manifest file must be saved during export
	 * operation or not.
	 * 
	 * @param state the new state
	 * @see #getManifestLocation()
	 */
	public void setSaveManifest(boolean state) {
		fSaveManifest= state;
		if (!fSaveManifest)
			
			setReuseManifest(false);
	}
	/**
	 * Tells whether a previously generated manifest should be reused.
	 * 
	 * @return	<code>true</code> if the generated manifest will be reused when regenerating this JAR,
	 * 			<code>false</code> if the manifest has to be regenerated
	 */
	public boolean isManifestReused() {
		return fReuseManifest;
	}
	/**