//-----------------------------------------------------------------
// Prepares the sector digitization, creates the vectors of
// tracks for each row of this sector. The track vector
// contains the track label and the position of electrons.
//-----------------------------------------------------------------
//
// The trasport of the electrons through TPC drift volume
// Drift (drift velocity + velocity map(not yet implemented)))
// Application of the random processes (diffusion, gas gain)
// Systematic effects (ExB effect in drift volume + ROCs)
//
// Algorithm:
// Loop over primary electrons:
// Creation of the secondary electrons
// Loop over electrons (primary+ secondaries)
// Global coordinate frame:
// 1. Skip electrons if attached
// 2. ExB effect in drift volume
// a.) Simulation calib->GetExB()->CorrectInverse(dxyz0,dxyz1);
// b.) Reconstruction - calib->GetExB()->CorrectInverse(dxyz0,dxyz1);
// 3. Generation of gas gain (Random - Exponential distribution)
// 4. TransportElectron function (diffusion)
//
// 5. Conversion to the local coordinate frame pad-row, pad, timebin
// 6. Apply Time0 shift - AliTPCCalPad class
// a.) Plus sign in simulation
// b.) Minus sign in reconstruction
// end of loop
//