Melbourne Morning for Chris Nicholson   As I sat resting on a back verandah a warm morning after the long flight, taking in air scented eucalypt, a dove cried and flew to land, startling memories of watching doves dust bathe, one wing raised for hours, sunning in your back yard, true Australians.   Some doves are natives here the diamond doves, the peaceful doves, the bar shouldered doves. All doves mate for life, just once. Your doves were diamond doves or maybe ring necked turtle doves, immigrants that picked up local habits over time, like us.   I could have…