Battlelines, by Tony Abbott, Melbourne University Press, 2009, $34.99. Tony Abbott opens his book with a prologue putting the case that Liberals should write more books. Authorship is a risky undertaking for any politician. Public humiliation is part and parcel of political life, and finding one’s opus in the Angus & Robertson two-dollar bin must prick even the toughest of hides, but by all accounts this book is selling well and is unlikely to be remaindered. The guts of the book start with Abbott’s thoughts on liberalism and conservatism. The Liberal Party began as a fusion of the liberal and…