+ search for input files in the $NPTOOL/Inputs/* and local directories
     is now performed in this class
   + this search was done previously in DetectorConstruction.cc and
     PrimaryGeneratorAction.cc files. these files have been modified
     accordingly.
   + If input files are not found, program exits

 - Test Performed everything is Ok!

	- Now the weight of each event is stored instead of using a rejection methods when making the phase space decay

* Adding a pure phase space Event Generator
	- Using an input file, one can simulate any many body phase space (up to 18 body)
	- Same weight methods is used as in TransfertToResonance

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  EventGeneratorXXX classes instead of part of its own private members

* Update of the TODO file

   - Limitation: only works for beams parallels to the optical axis
     (no beam divergence)
   - Only implemented for the moment in EventGeneratorTransfer.cc

* Changes in the INSTALL files to insist on having a working GSL install
  and a ROOT MathMore module

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   - Change path in PrimaryGeneratorAction.cc
   - Update HOWTO / README files