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
* Set whether a previously generated manifest should be reused.
	 * 
	 * @param state the new state
	 */
	public void setReuseManifest(boolean state) {
		fReuseManifest= state;
		if (fReuseManifest)
			
			setSaveManifest(true);
	}
	/**
	 * Returns the location of a user-defined manifest file.
	 * 
	 * @return	the path of the user-defined manifest file location,
	 * 			or <code>null</code> if none is specified
	 */
	public IPath getManifestLocation() {
		return fManifestLocation;
	}
	/**
	 * Set the location of a user-defined manifest file.
	 * 
	 * @param manifestLocation the path of the user-define manifest location
	 */
	public void setManifestLocation(IPath manifestLocation) {
		fManifestLocation= manifestLocation;
	}
	/**
	 * Gets the manifest file (as workspace resource).
	 *