* WFP misses monthly target of feeding 4 million Syrians
* Number of children in need has quadrupled in a year - UNICEF
* Human Rights Watch calls for action by U.N. Security Council
By Stephanie Nebehay
GENEVA, Dec 3 (Reuters) - The United Nations said on Tuesday it had delivered food to 3.4 million people in Syria in November, falling short again of its monthly target of 4 million as ...