One-line review: I laughed so hard at Richmond Shakespeare’s new production of “A Midsummer Night’s Dream” that I got a headache. The perennial favorite of Richmond Shakespeare and the Shakespeare canon itself is back for a short run at gorgeous Agecroft Hall. Andrew Hamm directs this time, pushing the comedy and mayhem way past any previous boundaries of taste, propriety, reverence for the Bard and other annoyances.