remove cmems registration message

[veenstrajelmer]

After simplifications of copernicusmarine_credentials(), it always displays a register text, even if the user is already logged in. This is slightly inconvenient, since it is called every time a single station is downloaded by dfmt.ssh_retrieve_data():

To reproduce:

import dfm_tools as dfmt
import matplotlib.pyplot as plt
plt.close("all")

lon_min, lon_max, lat_min, lat_max = 5, 20, 25, 50 # europe
subset_kwargs = dict(lon_min=lon_min, lon_max=lon_max, lat_min=lat_min, lat_max=lat_max, 
                     # time_min=time_min, time_max=time_max
                     )

subset_gpd = dfmt.ssh_catalog_subset(source="cmems-nrt", **subset_kwargs)
bool_rmn = subset_gpd["station_id"].str.startswith("RMN-")
subset_gpd = subset_gpd.loc[bool_rmn]

fig,ax = plt.subplots(figsize=(12,7))
source = subset_gpd.iloc[0]["source"]
nstations = len(subset_gpd)
subset_gpd.geometry.plot(ax=ax, marker="x", label=f"{source} ({nstations} obs)")
dfmt.plot_coastlines()

dfmt.ssh_retrieve_data(subset_gpd, dir_output=r"c:\Users\veenstra\Downloads\cmems-nrt_insitu")

Prints:

Downloading CMEMS data requires a Copernicus Marine username and password, sign up for free at: https://data.marine.copernicus.eu/register.
INFO - 2024-09-18T09:19:51Z - You are already logged in. Skipping login.
INFO - 2024-09-18T09:19:52Z - Dataset version was not specified, the latest one was selected: "202311"
INFO - 2024-09-18T09:19:52Z - Dataset part was not specified, the first one was selected: "latest"
INFO - 2024-09-18T09:19:52Z - You forced selection of service: original-files
INFO - 2024-09-18T09:19:52Z - Downloading using service original-files...
100%|██████████| 4/4 [00:27<00:00,  6.97s/it]
>> reading coastlines: 3.07 sec
retrieving data for 36 cmems-nrt stations: 1 Downloading CMEMS data requires a Copernicus Marine username and password, sign up for free at: https://data.marine.copernicus.eu/register.
INFO - 2024-09-18T09:20:26Z - You are already logged in. Skipping login.
2 Downloading CMEMS data requires a Copernicus Marine username and password, sign up for free at: https://data.marine.copernicus.eu/register.
3 Downloading CMEMS data requires a Copernicus Marine username and password, sign up for free at: https://data.marine.copernicus.eu/register.
4 Downloading CMEMS data requires a Copernicus Marine username and password, sign up for free at: https://data.marine.copernicus.eu/register.
5 Downloading CMEMS data requires a Copernicus Marine username and password, sign up for free at: https://data.marine.copernicus.eu/register.
6 Downloading CMEMS data requires a Copernicus Marine username and password, sign up for free at: https://data.marine.copernicus.eu/register.
7 Downloading CMEMS data requires a Copernicus Marine username and password, sign up for free at: https://data.marine.copernicus.eu/register.
8 Downloading CMEMS data requires a Copernicus Marine username and password, sign up for free at: https://data.marine.copernicus.eu/register.

If copernicusmarine would include a registration link in their login function (mercator-ocean/copernicus-marine-toolbox#139), we could remove the print from dfm_tools. This will be available from copernicusmarine>=2.0.0 onwards.