Some clean-up of the code and supression of the call to the plot routines in the main. That is replced by Anthony's code.

I verified that we can read the weight with another processor partition as the one use to compute them.
Small differences appear because of different rounding errors on the individual processors and the core proc who gives his values to the file.

Small change to avoir error when sorted_outareas is smaller than largest_pos (it occurs in Pantanal_n48)

Conflicts:
	RoutingPreProc.py