* Abu Dar Dar detained in Bamako -military source
* One of France's most wanted in its Mali mission
* Follows killing of jihadist 'Red Beard' this week
BAMAKO, March 16 (Reuters) - Malian authorities are holding one of the country's most wanted Islamist fighters after he surrendered to French troops, a military source and French radio said on Sunday.
France had been pursuing Abu Dar Dar...