A book review of The Blackwater Lightship by Colm Tóibín. Colm Tóibín is one of those gifted writers who is able to write moving, interesting, stirring and striking prose with such ease and with such a sparce use of vocabulary. And this book is no exception. The Blackwater Lightship is the sad tale of Declan Devereux, a young man dying of Aids in Ireland in the 1990s. He had…