* Marc/ticket/11896:
[ticket/11896] Use $form_time and fix out of bounds $form_time
[ticket/11896] Correctly document return of null in docblocks
[ticket/11896] Minor code improvements in phpbb_functional_test_case
[ticket/11896] Add functional tests for marking all notifications read
[ticket/11896] Add ability to define expected message after posting
[ŧicket/11896] Set form_time with time() when marking all notifications read