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
* Finds the config variable with the given name.
	 * 
	 * @param name
	 *            the variable name
	 * @return the config variable with the given name. Return <code>null</code>,
	 *         if not found.
	 */
	public ConfigVariable findConfigVariable( String name )
	{
		return module.findConfigVariabel( name );
	}
	/**
	 * Finds the custom color with the given name.
	 * 
	 * @param name
	 *            the color name
	 * @return the custom color with the given name. Return <code>null</code>
	 *         if it's not found.
	 */
	public CustomColor findColor( String name )
	{
		return module.findColor( name );
	}
	/**
	 * Finds the position of the image with the given name.
	 * 
	 * @param name
	 *            the image name to find
	 * @return position of image with the specified name. Return -1, if not
	 *         found.