HUGE crowds marched in Myanmar yesterday to denounce a February 1 military coup in a show of defiance after the bloodiest episode of the campaign for democracy the previous day, when security forces fired on protesters, killing two. The military has been unable to quell the demonstrations and a civil disobedience campaign of strikes against the coup and the detention of elected leader Aung San Suu Kyi and others, even with a promise of new elections and stern warnings against dissent. Tens of thousands of people massed peacefully in the second city of Mandalay, where Saturday's killings took place, witnesses…