Directory structure for multiple sensors

[falkamelung]

Currently the data for each orbit are in Chiles/SenD142. We should adapt a structure to be ready for multiple sensors

── Chiles
    ├── Sen
        └── mintpy
            ├── A120
            └── D142
        └── miaplpy
            ├── A120
            └── D142
   ├── Nisar
        └── mintpy
            ├── A120
            └── D142
        └── miaplpy
            ├── A120
            └── D142