class AliPHOSSDigitizer: public TNamed

 This is a TTask that makes SDigits out of Hits
 The name of the TTask is also the title of the branch that will contain
 the created SDigits
 The title of the TTAsk is the name of the file that contains the hits from
 which the SDigits are created
 A Summable Digits is the sum of all hits originating
 from one primary in one active cell
 A threshold for assignment of the primary to SDigit is applied
 SDigits are written to TreeS, branch "PHOS"
 AliPHOSSDigitizer with all current parameters is written
 to TreeS branch "AliPHOSSDigitizer".
 Both branches have the same title. If necessary one can produce
 another set of SDigits with different parameters. Two versions
 can be distunguished using titles of the branches.
 User case:
  root [0] AliPHOSSDigitizer * s = new AliPHOSSDigitizer("galice.root")
  Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
  root [1] s->Digitize()
             // Makes SDigitis for all events stored in galice.root
  root [2] s->SetPedestalParameter(0.001)
             // One can change parameters of digitization
 root [3] s->SetSDigitsBranch("Pedestal 0.001")
             // and write them into the new branch
 root [4] s->ExecuteTask("deb all tim")
             // available parameters:
             deb - print # of produced SDigitis
             deb all  - print # and list of produced SDigits
             tim - print benchmarking information

-- Author :  Dmitri Peressounko (SUBATECH & KI)