extend the EUTelGeo interface with getSiPlanesLayoutID() and rename siPlaneMediumRadLen to siPlaneRadLength, for consistency with Gear naming
adjust function calls to new EUTelGeo interface

this one is not needed any more
 const int    iPlane             = geo::gGeometry().sensorIDtoZOrder(planeID)

all EUTelGeo functions operate with actualy sensor ID, and not in the order of appearance nor in the Z-order in the gear xml file
adjust the function calls to EUTelGeo interface, direct calls to siPlanesLayout-> are disallowed
adjust to new EUTelGeo interface. Scattering information, material description from Gear xml file only. no assumptions to be made in the code.

the material adding should come exactly as it's described in Gear :: TelPlanes class //

no Si nor Kapton hardcoded assumptions allowed. no mixing of information from non-sensitive and sensitive layers.
move encoding scheme from the EUTelProcessorClustering here

+const char *   EUTELESCOPE::CLUSTERENCODING          = "sensorID:5,clusterID:12,xSeed:11,ySeed:10,xCluSize:9,yCluSize:9,type:5";
many changes to adjust to new EUTelGeo interface:

mainly of this type:

-               if ( _layerIndexMap.find( sensorID ) != _layerIndexMap.end() ){
-                       maxX = _siPlanesLayerLayout->getSensitiveNpixelX( _layerIndexMap[ sensorID ] ) - 1;
-                       maxY = _siPlanesLayerLayout->getSensitiveNpixelY( _layerIndexMap[ sensorID ] ) - 1;
-               } else {
-                       throw  InvalidGeometryException ("Unknown sensorID " + to_string( sensorID ));
-               }
+               maxX = geo::gGeometry().siPlaneXNpixels( sensorID  ) - 1;
+               maxY = geo::gGeometry().siPlaneYNpixels( sensorID  ) - 1;

however, bookHisto got a parameter to know which detectors are booked in the collections.
assumption: collections always contain detector frames, even empty ones. // odd
remove commented out code // geeomtry initilisation of old style
major code cleanup.

lots of adjustment to work with new EUTelGeo interface

dropped offset collection db
dropped correlation offset histograms as well

did not touch hit collections in this commit
run 1234 should work with new GEAR geometry description TelPlanes