dvStudyAtom: Obtain a study's Atom document
In leeper/dvn: Access to Dataverse 3 APIs

Use Data Deposit API to obtain an Atom document for a study.

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dvStudyAtom(objectid, dv=getOption('dvn'),
            user=getOption('dvn.user'), pwd=getOption('dvn.pwd'),
            browser=FALSE, ...)

`objectid`	Either a character string containing the id for a dataverse study (a handle) or an object of class “dvStudyAtom”. This could be returned from `dvUserStudies` (or, `dvSearch`, from the Data Sharing API).
`dv`	An optional character string specifying the Dataverse to query. Default is the Harvard IQSS Dataverse.
`user`	A character string containing a dataverse username. Default is `options('dvn.user')`.
`pwd`	A character string containing the corresponding dataverse password. Default is `options('dvn.pwd')`.
`browser`	A logical specifying whether the query should be executed in a web browser. Default is `FALSE`.
`...`	Optionally, additional arguments passed to `getURL` via `dvDepositQuery`.

A list containing:

`bibliographicCitation`	A full citation for the study, compiled from metadata.
`generator`	A vector containing details about the SWORD application.
`id`	The full URI for the study.
`objectId`	The `objectId` for the study.
`xml`	A character string containing an XML data structure that includes a study citation and handle.