Basic atomic - two channel

Here is an example of a the same information as in basic_flat, divided across the standard obsinfo file structure. You can see that there are many fewer lines and less repetition.

The file below can be found in instrumentation_files/subnetworks/EXAMPLE_essential.subnetwork.yaml, with configurations removed for simplicity. To see what configurations do, see Basic atomic + configuration - two channel.

---
format_version: "1.0
revision:
    authors:
        - {$ref: "persons/Wayne_Crawford.person.yaml#person"}
    date: "2019-12-19"
subnetwork:
    operators:
        -   {$ref: "operators/INSU-IPGP.operator.yaml#operator"}
    network:
        $ref: "networks/EMSO-AZORES.network.yaml#network"
    stations:
        "BB_1":
            site: "My favorite site"
            start_date: "2011-04-23T10:00:00Z"
            end_date: "2011-05-28T15:37:00Z"
            location_code: "00"
            locations:
                "00":
                    base: {$ref: 'location_bases/INSU-IPGP.location_base.yaml#location_base'}
                    configuration: "BUC_DROP"
                    position: {lon.deg: -32.234, lat.deg: 37.2806, elev.m: -1950}
            instrumentation:
                base: {$ref: "instrumentations/BBOBS1_pre2012.instrumentation_base.yaml#instrumentation_base"}
                configuration: "SN07"
                modifications:
                    datalogger: {configuration: "62.5sps"}
            processing:
                - clock_correction_linear:
                        base: {$ref: "timing_bases/Seascan_GNSS.timing_base.yaml#timing_base"}
                        start_sync_reference: "2015-04-23T11:20:00"
                        end_sync_reference: "2016-05-27T14:00:00.2450"
                        end_sync_instrument: "2016-05-27T14:00:00"