+ Call to AddDetector() method was missing

* Finish NPAnalysis for W1 detector
   + Cases with multiplicity greater than one are treated
   + Excitation energy is reconstructed OK without strip
   + Excitation energy taking into account strips should be checked
     in more details.

* Cosmetic for screen printing in NPLib classes

   + GetPositionOfInteraction() method is now implemented

* Add analysis support to W1
   + To be tested

* Changing default simulation name in Gaspar

* Change RunToTreat.txt file to treat by default the ROOT output file from
  NPSimulation

   - Effect of beam tracker is now taken into account

* Add new cross-section files

   + 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 output is now on a single line

* Add some documentation for Gaspard (not yet finished)

   - changes made in RootInput.cxx file

* New version of Gaspard analysis code