class AliITSUTrackerGlo: public AliTracker

 Default constructor

 Default destructor

 init with external reconstructor

 creates default tracking conditions to be used when recoparam does not provide them

 Do outward fits in ITS

 refit the tracks inward, using current cov.matrix

 read from tree (if pointer provided) or directly from the ITS reco interface

 Remove clusters from the memory


  AliITSURecoDet *det=fReconstructor->GetITSInterface();
  Int_t nlayers=det->GetNLayersActive();
  for (Int_t i=0; i<nlayers; i++) {
      TClonesArray *clusters=*(det->GetLayerActive(i)->GetClustersAddress());
      clusters->Delete();
  }

 To be implemented

 do we need to match this track to ITS?

 find prolongaion candidates finding for single seed

 init prolongaion candidates finding for single seed

 transport seed from layerFrom to the entrance (along the direction of the track) of layerTo or to rLim (if>0), wathever is closer

 transport track from layerFrom to the entrance of layerTo or to rLim (if>0), wathever is closer

 transport track from layerFrom to the entrance of layerTo but do not pass control parameter X

 go to the exit from lr in direction dir, applying material corrections in steps specific for this layer
 If check is requested, do this only provided the track has not exited the layer already

 go to the exit from lr in direction dir, applying material corrections in steps specific for this layer
 If check is requested, do this only provided the track has not exited the layer already

 go to the entrance of lr in direction dir, w/o applying material corrections.
 If check is requested, do this only provided the track did not reach the layer already

 go to the entrance of lr in direction dir, w/o applying material corrections.
 If check is requested, do this only provided the track did not reach the layer already

 calculate road width in terms of phi and z for the track which MUST be on the external radius of the layer
 as well as some aux info

 mark all seeds in the pool as unused

 account that this seed is "deleted"

 Check if the cluster (in tracking frame!) is matching to track.
 The track must be already propagated to sensor tracking frame.
 Returns:  kStopSearchOnSensor if the search on given sensor should be stopped,
           kClusterMatching    if the cluster is matching
           kClusterMatching    otherwise

 check if the seed should not be discarded

 propagate seed to given x applying material correction if requested

 propagate seed to given x applying material correction if requested

 finalize single TPC track hypothesis

 select winner for each hypothesis, remove cl. sharing conflicts

 remove eventual cluster sharing conflicts

 update ESD track with current best hypothesis

 refit track till radius rDest. The cluster,mass info is taken from fCurrHyp (and its winner seed)
 if stopCond<0 : propagate till last cluster then stop
 if stopCond==0: propagate till last cluster then try to go till limiting rDest, don't mind if fail
 if stopCond>0 : rDest must be reached

 build MC label

 add new prolongation branch for the seed to temporary array. The seeds are sorted according to Compare f-n

 keep allowed number of branches for current seed and disable extras

 transfer allowed number of branches to hypothesis container

 check seed backward propagation chi2 and matching to TPC

 remove those hypothesis seeds which dont lead to candidates at final layer

 1st, flag the seeds to save

 clean hypothesis

 set special bit on split clusters using MC info

 check if the seed contains split cluster with size < maxSize

 print seeds clusters

 mark used clusters

 check cluster usage info

 book special control histos

 get id for the requested histo

 monitoring stuff