12/11/2008, version 1.01a
   Enclosed the mt2 class in namespace "mt2_bisect" to make it more convenient to use and compare with other mt2 calculators. Also changed the source file name.

   
12/08/2008, version 1.01

   Replaced unnecesary uses of the function pow() by direct multiplications. Used more intermediate expressions. The program has smaller numerical errors and runs faster.
   Adapt the code such that the performance does not depend on the unit of the momentum.


10/26/2008, version 1.00.
   The initial version.

