[data-packages][m]: refactor to be clearer, provide list of attributes for file info and define required attributes.
[data-packages][s]: remove Matthew Brett notes links as now somewhat out of date.
[data-packages][s]: remove catalog material and put in an issue as not yet mature https://github.com/dataprotocols/dataprotocols/issues/37.
[data-packages][m]: change spec to have resources rather than files.

* This is a major change but one permitted as we are still in draft.
* Worth doing as likely a better term, compatible with ckan etc