Currently we have a mahara_log function that logs page visits
So I decided we also need a mahara_touch_record($table, $id) function
that updates the 'atime' for a record when called

behatnotneeded

Change-Id: I2f645c8357426112f9edcdd24f1b8b85513cb7cb
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>