[Clas12_calcom] challenge data sample

[Raffaella De Vita]

Dear All,
as mentioned at the meeting today, Nathan H. and I have produced a 
sample of the pseudo data we plan to use for the challenge. The 
generated and reconstructed files are in
     /volatile/clas12/devita/challenge .

The folder sample contains the gemc evio files the decoded hipo files 
and the cooked files in separate folder. The skims folder contains a 
couple of skimmed files with the relevant banks for ctof and ftof 
calibration.
These files were produced using:
- pythia as event generator,
- gemc 4a.1.0, with full CLAS12 (4-layer svt) and 10^34 bg,
- coatjava 4a.6.0 for reconstruction.
This is not yet the final configuration because we plan to update gemc 
with the new RF package and other changes but should be already good 
enough to do the first checks.

I would like to ask all detector groups to take a look, possibly run 
their calibration suites on these files and give us feedback.
Best regards,
     Raffaella