Replace placeholder CSVW dialect

[RickMoynihan]

We currently have a placeholder for the CSVW dialect we should replace this with a real CSVW dialect.

If the default dialect is correct we could add it, at least in the data:

{
  "encoding": "utf-8",
  "lineTerminators": ["\r\n", "\n"],
  "quoteChar": "\"",
  "doubleQuote": true,
  "skipRows": 0,
  "commentPrefix": "#",
  "header": true,
  "headerRowCount": 1,
  "delimiter": ",",
  "skipColumns": 0,
  "skipBlankRows": false,
  "skipInitialSpace": false,
  "trim": false
}