v20b corresponds to the enlarged z-expansion for the layers and the
start positions of 17n. In Addition the correlated header files for the
CbmTrdPads are added

Due to some not understood error the compilation of the AnalysisTreeQA package
fails suddenly. No changes were done. Since the problem affects the
compilation of CbmRoot it was decided to switch of the compilation till the
problem is understood and fixed.

Create images for inheritance hierarchy.

Remove obsolete and already commented code.
Remove created artefacts after 1 day automatically.
Install graphiz package needed for doxygen production.

- bring in TRD 20a with extended stations stepping

The latest version of all repositories contain the new tof geometries
and parameters.

All unpackers are independent of the FairRoot framework, so the includes
can be removed.
Use the generic Logger instead of FairLogger which is meanwhile only a wrapper
around the Logger.

- Formatting update
- Implement reflectivity for the RICH mirror using GEANT4 methods.
- Update rich macros and scripts
- Add DoZShift flag.

The entry for the CbmPsdDigi in the file DataLinkdef.h was wrong, such that
for the CbmPsdDigi a streamer was generated which does not support automatic
schema evolution. To overcome the problem a custom streamer with explicit
schema evolution was added. This streamer allows to read also CbmPsdDigi
Version 3 data from existing files. Refs #1814