String to indicate how grid is ordered on its loading:
first char can be A (ascending) to have an ascending order, or D (descending) for that one descending; following number is the column that determines sorting index, present in the $ArraySortAsc[index] array (contained in the PHP file indicated bydataUrl) in the case first char would be "A", or in $ArraySortDesc[index] array for the first char equal to "D", with the sintax:
[ A , D ] first_field_determining_sort_index , ... , [ A , D ] n-field_determining_sort_index.
| "A0" | first $ArraySortAsc field determines initial sorting in ascendenting mode |