Download inputs as a csv

[louispt1]

Download inputs as a csv with:

• key
• min
• max
• present value: default
• future value: user
• unit
• share group

at /api/v3/scenarios/2601971/inputs.csv

Closes #1449

[mabijkerk]

Fast work! Two questions:

1. Normally when we download a data-export, the SessionID is appended to the file. Instead of inputs.csv I would then get inputs.123456.csv. Is this something we can add here as well?
2. When I go to the JSON inputs endpoint, all the default values are filled in. For example costs_bio_ethanol has "default": 0.948245519132. When I download the CSV for the same scenario however, this key (and a lot of other keys) have no default value. Is something going wrong here?

[louispt1]

Good points! I have resolved both I think, and added some additional spec for the csv download - could you verify again @mabijkerk?

[mabijkerk]

No I get this error I think:

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