+ Update trapezoid geometry for gaspard

   + geant4 files are kept in the include and src directories
   + one directory is created for each detector. This directory
     contains the associated headers and sources files
   + a script directory is created with some scripts allowing the
     conditional compilation

 * Add #ifdef statements in DetectorConstruction.cc file
   + this applies to each detector header

 * Move G4MultiFunctionnalDetector.hh header from Sharc.cc to 
   Sharc.hh

 - Put 2009-2013 copyright date
 - Change the place of the ifndef position to avoid multiple inclusion of comment line

      ---------------        ^
      \             /        | v   u = (128,1) - (1,1)
       \           /         |     v = (1,128) - (1,1)
        \         /    <------ 
         \       /        u        and w = u x v in direction
          -------                  of third stage

* gaspHyde geometry is now well-defined

* Stripping scheme in NPS and NPA still to be done

* Clean GaspardTrackerTrapezoidi.cc and GaspardTrackerAnnular.cc code
   + remove dummy code for aluminium dead layer
   + adapt variable names for gaspard detecor

* ParisPhoswich: remove compilation warning

   - mainly adds support for solid D2 cryogenic target

No commit message

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

  directly from the namespace of each class.

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