Row headers in "Edit Access" table are confusing for screen reader users

[Jono M]

When sharing a page or collection (/view/access.php), the row headers in the column are overly complex and confusing for people navigating using a screen reader.
Currently there are two rows of <th> cells with different information in each row and various blank cells. These should be combined into one single row with headings like "Accessible from:", "Accessible to:", and hidden header cells where appropriate (eg. "Editing buttons" for the last row)

Affects latest master

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/2983

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/2983
Committed: http://gitorious.org/mahara/mahara/commit/ad0c715c097b21b0e1e65af6fbb056c19830b668
Submitter: Son Nguyen (<email address hidden>)
Branch: master

commit ad0c715c097b21b0e1e65af6fbb056c19830b668
Author: Jono Mingard <email address hidden>
Date: Tue Feb 4 16:54:27 2014 +1300

Rearranged table headers in Edit access (Bug #1262487)

Collapsed the two header rows into one, added hidden headers where
appropriate and added labels to the "Comments" checkboxes.

Change-Id: Ia34e8022beab2f056ba08a56b31d1b35134ef75c
Signed-off-by: Jono Mingard <email address hidden>