+ Target.{hh,cc} class now has a method returning the target material
   + VEventGenerator.{hh,cc} class now returns the effective thickness
     of target seen by the beam before interaction (method CalculateBeamInteraction)
   + Propagate these changes in the different EvenGenerators

* Update Gaspard documentation

  + the index of maps now include the detector number

  + the index of all maps now includes the number of the detector

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   - the output is now on a single line

* Add some documentation for Gaspard (not yet finished)

   - indexes are now defined with a map in GaspardTrackerModule.{h,cxx}
   - this removes warnings at compilation time

   - case for TInitialConditions, TInteractionCoordinates, 
     TGaspardTrackerData and TPlasticData
   - one method was added:    void Clear(const Option_t*) {};
   - one method was modified: void Dump() const;

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   - Take into account energy loss in the target for reconstruction
     of the excitation energy
   - change makefile to recompile when header files are changed

* Clean some part of the code to remove warnings at compilation time

  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

   - This is useful for elastic scattering studies

* Add CH2 material for target definition

* Change ushort for unsigned short in *.cc files

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  directly from the namespace of each class.

* Documentation file (empty for the moment) for the Gaspard project is 
  added

* Rename Gaspard geometry input files

* Add one differential cross section file

* Fill all fields of the TInitialCondition class for an isotropic event
  generator

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   - Use value of detector size from the GPDxxx namespace
   - Modify GaspardTrackerSquare.cc and GaspardTrackerDummyShape.cc accordingly

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