* Areva and Niger at odds over uranium money
* Documents seen by Reuters reveal tax concessions for French group
* Officials and NGOs blame corruption for sustained poverty
* Talks on new deal have stalled
By Daniel Flynn and Geert De Clercq
ARLIT, Niger/PARIS, Feb 5 (Reuters) - When France began mining uranium ore in the desert of northern Niger in the early 1970s, Arlit was a ...