Comment 2 for bug 1816480

Fixes for Angular grid pushed:

https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/berick/lp1816480-ang-grid-aria

From the commit:

* Apply "grid", "row", "columnheader", and "gridcell" role attributes.
* Page-Down goes to next page
* Page-Up goes to previous page
* Shift-UpArrow extends selection one row up (spanning pages).
* Shift-DownArrow extends selection one row down (spanning pages).
* Shift-Arrow controls support reverse navigation for back-tracking to de-select certain rows.
** E.g. shift-up 3 rows then shift-down 1 will leave 2 rows selected.
* Control-A now selects all rows in the page.
** For consistency with the select-all checkbox, only rows in the current page are selected.
** Note we could add an option to extend the selection to all rows, but it would require pre-fetching all of the data, similar to how grid printing pre-fetches.
* Adds a bit of text in the grid toolbar (left of first button) indicating how many rows are currently selected.