Prevent the question engine from blocking return/enter key presses
from being sent to the Atto editor.

(no double newlines)

Line length issues Andrew missed off.

Add check to mod_form to prevent "reopen until pass" and "blind marking" both being on

Do not try and calculate this inside mod_assign - it's a gradebook thing only.

Conflicts:
	theme/bootstrapbase/style/moodle.css

used

The issue was that clean_param took an int and returned a string
and the result was used in an exact comparison.
The type change mean the comparison failed.
The solution was to ensure the param was cast as a string.

Implemented a means by which cache store instance can communicate
warnings due to things such as conflicting configurations etc.

MDL-45339 Libraries: Add a note to docblock of get_config, set_config, and unset_config to note they are used in lib/db/upgrade.php