Replaced with a global $SESSION var, deferring cleanup to session
destroy.

All behat drivers are now replicating human behavior
so when the browser scrolls something into view it doesn't account
for fixed positioned elements that end up obscuring the item thus
leading to errors that could be avoided by scrolling an additional amount.

Peter Miller authored Jan 04, 2016 and Cameron Ball committed Jan 04, 2016

This patch fixes a problem where the course and user reports, when viewed by
a student, were incorrectly including hidden grade items in the course totals,
making the percentages lower than they should be.