Single-CPU benchmark on XeonEM64T
Remarks:
- mod2as : First problem size (N = 100) gives incorrect values for result
           vector at i = 98 (difference = 1.0) and i = 99 (difference = 2.0).
	   Must be attributed to compiler: with Intel ifc 7.1 compiler
	   correct answers are obtained.
- mod2d  : Incorrect answers for N = 30 and 75 <= N <= 500. For N > 500
           we get: "./xrun: line 22: 17089 Segmentation fault      x.mod2d"
	   (where xrun is the run script starting executable x.mod2d).
	   Again, this did not occur with the Intel ifc 7.1 compiler.	   
