Adding the class AliTPCPreprocessorOnline (Lars)

Adding the class AliTPCPreprocessorOnline (Lars)

//  Preprocessor class for HLT and DAQ                                        //
//  Possible usage: preprocess TPC calibration data                           //
//  to form needed for online viewing/visualizing TPC calibration data        //
//                                                                            //
//  On HLT or DAQ AliTPCPreprocessorOnline::AddComponent(...) is called,      //
//  whereas ... is either an AliTPCCalPad, or an AliTPCCalROC.                //
//  Their names have to be acording the naming convention for AliTPCCalPads   //
//  Special for CalROCs: Add '_ROC<ROC_Number>' to the name.                  //
//                                                                            //