Three opposition parties merge under umbrella party in Turkish parliament / Turkish opposition party loses 2 lawmakers critical of direction / Opposition parties in Turkish Parliament in turmoil over recent lawmaker resignations / Chaos in Turkey's parliament as huge fight breaks out between raging MPs / Turkish official to meet smaller parties for new constitution / Turkish-led party aims to combat rising racism in Germany / Turkish parties 'open-minded' about new constitution / Turkish political parties gear up to weigh odds of new constitution / Turkey's main opposition party deals a significant blow to president's party / Turkey's main opposition party was poised to control most of the country's largest cities while claiming a surprise victory in local elections that represent a rebuke to President Erdogan, reflecting discontent with the country's turbulent economy.