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
{
		LibraryCommand command = new LibraryCommand( module );
		command.addLibrary( libraryFileName, namespace );
	}
	/**
	 * Drops the given library from the included libraries of this design file.
	 * 
	 * @param library
	 *            the library to drop
	 * @throws SemanticException
	 *             if error is encountered when handling
	 *             <code>IncludeLibrary</code> structure list. Or it maybe
	 *             because that the given library is not found in the design. Or
	 *             that the library has descedents in the current module
	 */
	public void dropLibrary( LibraryHandle library ) throws SemanticException
	{
		if ( library == null )
			return;
		LibraryCommand command = new LibraryCommand( module );
		command.dropLibrary( (Library) library.getElement( ) );
	}
	/**
	 * Reloads the library with the given library file path. If the library
	 * already is included directly, reload it. If the library is not included,
	 * exception will be thrown.
	 * <p>
	 * Call this method cautiously ONLY on the condition that the library file
	 * is REALLY changed outside. After reload successfully, the command stack
	 * is cleared.