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/Module.java
* @param elementName
	 *            name of the element
	 * @param nameSpace
	 *            name space
	 * @return the resolved element if the name can be resolved, otherwise,
	 *         return null.
	 */
	private DesignElement resolveNativeElement( String elementName,
			int nameSpace )
	{
		NameSpace namespace = nameSpaces[nameSpace];
		return namespace.getElement( elementName );
	}
	/**
	 * Sets the exceltion list into this module.
	 * 
	 * @param allExceptions
	 *            exception list to set
	 */
	protected void setAllExceptions( List allExceptions )
	{
		this.allExceptions = allExceptions;
	}
	/**
	 * Returns the <code>URL</code> object if the file with
	 * <code>fileName</code> exists. This method takes the following search
	 * steps:
	 * <ul>
	 * <li>Search file taking <code>fileName</code> as absolute file name;
	 * <li>Search file taking <code>fileName</code> as relative file name and