Author: Damyon Wiese
MDL-44116 Atto: Improve new accessibility sniffs.
Check for empty text it row, column headers and captions on tables.
Link to "Entire document" text instead of repeating the entire document if the text is long and has no headings.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=016bbe2c2c59a89af44de7bb166adbf1ad212112
http://github.com/moodle/moodle/commit/016bbe2c2c59a89af44de7bb166adbf1ad212112
+ 2.8 en [entiredocument,atto_accessibilitychecker]