• remove header scroll handling as it is interfering with the horizontal scroll of the grid
• reverse the recent change to the multicolumn sort indicator span location in the DOM
• add getHeader() and getHeaderColumn() functions. Add these to public interface. Change getHeaderRowColumn and getFooterRowColumn so that they accept either a column id (text) or a column index (number) as a parameter
• Detail view update (#202)
• Fix various issues with tristate and multicolumn sorting, including #211, #212
• in measureScrollbars(), use $viewport variable instead of looking it up in the DOM