Improve behavior of "scroll" grid option:  - scrollbar now reflects total number of elements  - when scroll is set to `true', behaves as before, and as you scroll later in the grid, all earlier lines are preserved.  - when scroll is set to any other true-ish value, grid will just load enough lines to cover the visible rows.
Improve behavior of "scroll" grid option:
 - scrollbar now reflects total number of elements
 - when scroll is set to `true', behaves as before, and as you scroll later in the grid, all earlier lines are preserved.
 - when scroll is set to any other true-ish value, grid will just load enough lines to cover the visible rows.

javapark/jqgrid