Restructure data directories

[morcuended]

Separate muons, DL1 data check, subrun-wise DL1 files

[morcuended]

a bit of directory restructuring has been done in #240

muons, datachecks and interleaved files are going to be moved to subdirectories inside the DL1 directory:

/fefs/aswg/data/real/
├── R0
├── monitoring
├── running_analysis
├── DL1/
│   └── YYYYMMDD/
│       └── prod_id/
│           ├── muons/
│           │   └── muons.fits
│           ├── interleaved/
│           │   └── interleaved.h5
│           └── dl1b_prod_id/
│               ├── dl1_subrun.h5
│               ├── dl1_run.h5
│               └── datacheck/
│                   ├── datacheck_dl1_subrun.h5
│                   ├── datacheck_dl1_run.h5
│                   └── datacheck_dl1_run.pdf        
├── DL2
└── ...