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
* Note: The configure variable in library file will be hidden if the one
	 * with the same name appears in design file.
	 * 
	 * @return the iterator over all config variables.
	 * @see ConfigVariableHandle
	 */
	public Iterator configVariablesIterator( )
	{
		return getFilteredStructureList( CONFIG_VARS_PROP,
				ConfigVariable.NAME_MEMBER ).iterator( );
	}
	/**
	 * Returns the iterator over all structures of color palette. Each one is
	 * the instance of <code>CustomColorHandle</code>
	 * 
	 * @return the iterator over all structures of color palette.
	 * @see CustomColorHandle
	 */
	public Iterator customColorsIterator( )
	{
		return getStructureList( COLOR_PALETTE_PROP ).iterator( );
	}
	/**
	 * Drops a config variable.
	 * 
	 * @param name
	 *            config variable name
	 * @throws SemanticException
	 *             if no config variable is found.
	 * @deprecated