Revert "add sessionCheck.php"
Revert "add sessionCheck.php"

This reverts commit b3beec1446eacbf1bea3c2958763a51095faf3c1.

Conflicts:
	teacherInterface/sessionCheck.php

be-oi/beoi-contest-platform,France-ioi/bebras-platform,be-oi/beoi-contest-platform,be-oi/beoi-contest-platform,be-oi/beoi-contest-platform,France-ioi/bebras-platform,France-ioi/bebras-platform,France-ioi/bebras-platform,France-ioi/bebras-platform,be-oi/beoi-contest-platform,be-oi/beoi-contest-platform,France-ioi/bebras-platform