FairSource for the timeslice-based reconstruction output in the online binary

The class provides an implementation of FairSource (CbmSourceRecoTimeslice) to read the hits and tracks, which are stored during a timeslice reconstruction in the online binary. The class CbmTaskInspectRecoTimeslice is a demonstrator of accessing the corresponding vectors.

algo/base/PartitionedSpan.h

@@ -156,7 +156,7 @@ namespace cbm::algo
     void EnsureDimensions() const
     {
       if (fOffsets.size() - 1 != fAdresses.size()) {
-        throw std::runtime_error("PartitionedSpan: fOffsets.size() != fAdresses.size()");
+        throw std::runtime_error("PartitionedSpan: fOffsets.size() - 1 != fAdresses.size()");
       }
       if (fOffsets.front() != 0) throw std::runtime_error("PartitionedSpan: fOffsets.front() != 0");
       if (fOffsets.back() != fData.size()) {