added cross-provider unique 'seatet_id'

[tomsail]

Added a new field seaset_id that contains a unique identifier for the whole catalog.

The 5 providers in the catalog:

• IOC
• COOPS
• EMODNET
• CMEMS
• GESLA3
  all have a corresponding field: <provider>_id that is = None if the station has no data from that provider.

There are 2 version now of the catalog:

1. catalog_full.csv: containing 6115 stations
2. catalog_minimal.csv that condenses all the stations based on their location >> reduced to 3670 stations.

[pmav99]

the PROXY env variables are BDAP specific and they need to be removed.

[tomsail]

@pmav99 have a look and let me know what you think!

[tomsail]

nos_id i.e. the station_id parameter for COOPS was not in the catalog.
I had to add it in the Notebook (at the beginning, 4th cell)

Now going through every row of the catalog, I can use searvey directly to fetch stations from both COOPS and IOC