- Fix case table disappearing row on edit bug

This was an apparent browser bug in Safari 6.0.5. We fix it by forcing an additional redraw.

codap/apps/dg/libraries/slickgrid/slick.grid.js [ In renderRows(), "touch" the offsetWidth of the newly inserted row to force a redraw to fix apparent Safari 6.0.5 bug. ]

codap/frameworks/SlickGrid [ Update SlickGrid submodule reference. ]

codap/frameworks/SlickGrid/slick.grid.js [ In renderRows(), "touch" the offsetWidth of the newly inserted row to force a redraw to fix apparent Safari 6.0.5 bug. ]