Add hydropandas extension

[dbrakenhoff]

• methods to quickly add hpd.Obs or hpd.ObsCollection to a pastastore
• some thin wrappers around hydropandas for downloading BRO or KNMI data
• convenient option to update time series currently in store from BRO or KNMI.

[dbrakenhoff]

Test fails probably because too many connection attempts to KNMI API

[martinvonk]

Test fails probably because too many connection attempts to KNMI API

Maybe we can cache this as well? With @lru_chache decorator?

[dbrakenhoff]

Test fails probably because too many connection attempts to KNMI API

Maybe we can cache this as well? With @lru_chache decorator?

Not sure what we're testing if we're loading from the cache in a test that wants to download the information :P. But we could rewrite the tests to load from a file. Or very pragmatic, just allow it to fail since it's non-essential to pastastore. That way we can see if it works, but it won't block any PRs etc.