class HHistConverter: public TObject

_HADES_CLASS_DESCRIPTION

 HHistConverter

 Stores/reads Histograms in linear TArrayD. Supports
 TH1D, TH2D, TH3D and non constant binning.
 Helper class for using histograms in HParCond
 containers. Only array data will be stored to ORACLE.
 The Data can therefore be displayed in ORACLE or ASCII
 file format.
 To fill the Array linData one can fill first Histograms
 and convert them using the function

 static void  HHistConverter::fillArray(const TH1* h,TArrayD& linData,TString name,Int_t nvals,Int_t width, Bool_t print)

 where name (lable), nvals (number of displayed values /row),
 width (formating digits for the fields in row and print
 are options to display the result of the convertion.

 From an existing array a Histogram cand be constructed with

 static TH1* HHistConverter::createHist(TString name,const TArrayD& linData)

 The created histogram with name "name" is dispatched from the
 directory (hist->SetDirectory(0)).
 The Array has the following structure:

 array[0]                    = dimension of Histogram (1-3)
 array[1]                    = n Bins in x
 array[2]                    = n Bins in y (0 if 1 dim)
 array[3]                    = n Bins in z (0 if 1 or 2 dim)
 array[4 - 4 + nbinsx + 1]   = x axis  (nBinx+1 values)
 array[....]                 = y axis  (if dim > 1, nBiny+1 values)
 array[....]                 = z axis  (if dim > 2, nBinz+1 values)
 array[....]                 = data of histcontent linearized form

 linearization (bin starting from 0):
                  1 dim     ind = xbin
                  2 dim     ind = xbin * nBiny + ybin
                  3 dim     ind = xbin * nBiny * nBinz + ybin * nBinz + zbin