Too Much Luck: The Mining Boom and Australia’s Future by Paul Cleary Black Inc., 2011, 160 pages, $24.95 The Sweet Spot: How Australia Made Its Own Luck—and Could Now Throw It All Away by Peter Hartcher Black Inc., 2011, 288 pages, $29.95 Are Australians the Homer Simpsons of the South Pacific—lazy, beery, stupid, lucky? Or are we sensible Jiminy Crickets who in the end will always let our conscience be our guide? These conflicting faces of Australians are summed up in new rival manifestos by two respected journalists—Too Muck Luck by Paul Cleary of The Australian and The Sweet Spot…