Bug 152828 Add the projectFolder property on module
When user doesn't set the resource folder path in designer, there should be a default working path for Birt to manage the report design and find the related resources. A new property should be added on Module: name: projectFolder type:URL This property only can be given from the open design method from session but should not be set after the module initialized. Concern about the backward compatiblity issue, a new method will be added. Open design with a config argument.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
{
		ElementPropertyDefn propDefn = module.getPropertyDefn( SCRIPTLIBS_PROP );
		if ( scriptLib == null )
			return;
		PropertyCommand cmd = new PropertyCommand( getModule( ), getElement( ) );
		cmd.removeItem( new CachedMemberRef( propDefn ), scriptLib );
	}
	/**
	 * Removes special script lib handle.
	 * 
	 * @param scriptLibHandle
	 *            script lib handle
	 * @throws SemanticException
	 */
	public void dropScriptLib( ScriptLibHandle scriptLibHandle )
			throws SemanticException
	{
		ElementPropertyDefn propDefn = module.getPropertyDefn( SCRIPTLIBS_PROP );
		if ( scriptLibHandle == null )
			return;
		PropertyCommand cmd = new PropertyCommand( getModule( ), getElement( ) );
		cmd.removeItem( new CachedMemberRef( propDefn ), scriptLibHandle
				.getStructure( ) );
	}
	/**
	 * Removes all script libs.
	 * 
	 * @throws SemanticException
	 */
	public void dropAllScriptLibs( ) throws SemanticException