Today is the day which, in 1692, witnessed the Massacre of Glencoe  –  70 MacDonalds murdered under trust for alleged treason. It remains one of the darkest episodes in Scotland’s history and has captured the imagination of musicians and writers ever since Sir Walter Scott’s wrote his  little-known poem ‘On the Massacre of Glencoe’ and now an Edinburgh-based company Double Take Projections has created a video showing the words of Scott’s poem, being beamed, on location,…