Add script to streamline DL1 merging for different productions
Summary
Currently, lstchain_merge_hdf5_files.py can merge produced DL1 files without any issues, but only for one set of input files. I.e., in order to merge protons, point-source gammas and diffuse gammas, one needs to call it three times. For multiple productions the number of manual calls increases accordingly. This is daughter issue for #30 (closed)
What is the expected correct behavior?
Would be great to have it somewhat automatized.
Relevant logs and/or screenshots
There could be few ways to resolve it. Easiest (but less flexible) is to include merging in the R0 to DL1 conversion step by adding a merge job which will depend on the conversion jobs and will run after they are completed. However this won't allow to merge automatically already existing productions. Another way is to write a separate processing step which would group the files for input and output depending on the configuration provided.