class AliITSBadChannelsAuxSPD

 AliITSBadChannelsAuxSPD implementation by P. Nilsson 2005
 AUTHOR/CONTACT: Paul.Nilsson@cern.ch

 Auxiliary algorithms for the SPD

 This class contains converter methods and general algorithms for
 handling digit <-> channel convertions and methods for identifying
 changes (diff's) in arrays of bad channels, and for finding channels
 or digits in arrays of bad channels.

 The Diff algorithm can be used to check if there are any changes among
 the noisy channels. It returns two arrays, one with noisy channels
 are no longer visible (less likely to happen) and one with newly found
 noisy channels (more likely to happen).

 The Find algorithms looks for a given digit or channel in an array of
 known channels. It can be used by the clustering algorithms to check
 if a given digit that is about to be clustered, is in fact a known
 noisy channel. It should not be used in a normal cluster.

 Examples - Converters

 root [0] AliITSdigitSPD *d = new AliITSdigitSPD();
 root [1] d->SetCoord1(1);
 root [2] d->SetCoord2(2);
 root [3] d->SetSignal(1);
 root [4] AliITSBadChannelsAuxSPD *aux = new AliITSBadChannelsAuxSPD();
 root [5] AliITSChannelSPD *c = aux->CreateChannelFromDigit(d);
 root [6] cout << c->GetColumn() << endl;
 1
 root [7] cout << c->GetRow() << endl;
 2
 root [8] AliITSdigitSPD *d2 = aux->CreateDigitFromChannel(c);
 root [9] cout << d2->GetCoord1() << endl;
 1
 root [10] cout << d2->GetCoord2() << endl;
 2
 root [11] cout << d2->GetSignal() << endl;
 1
 root [12] delete d2;
 root [13] delete d;
 root [14] delete c;

 The signal member of the digit is not a member of the channel class.
 It is artificially introduced by the CreateDigitFromChannel method and
 is per default set to 1.

 Modified by D. Elia, H. Tydesjo
 March 2006: Mixed up coordinates, bug fixed