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/core/DesignSession.java
}
		else
		{
			Object actualValue = ( (ElementPropertyDefn) propDefn )
					.validateValue( null, value );
			defaultValues.put( propName, actualValue );
		}
	}
	/**
	 * Gets the default value of the specified style property. If the property
	 * is not style property, null will be returned.
	 * 
	 * @param propName
	 *            style property name
	 * @return The default value of this style property. If the default value is
	 *         not set, return null.
	 */
	public Object getDefaultValue( String propName )
	{
		assert !StringUtil.isBlank( propName );
		MetaDataDictionary dd = MetaDataDictionary.getInstance( );
		IPropertyDefn propDefn = dd.getStyle( ).getProperty( propName );
		assert propDefn != null;
		return defaultValues.get( propName );
	}
	/**
	 * Sets the algorithm of how to search a file. Any existing algorithm is
	 * discarded.
	 * 
	 * @param algorithm