listRequest: Make a list request for static data
In CharlesCara/Datastream2R: Allows access to Datastream data from R

listRequest Function that returns a the value of Expression for the instrument list in DSCode from Datastream

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listRequest(dwei = getDataStream(), DSCode, Expression = "",
  startDate = Sys.Date(), endDate = Sys.Date(), frequency = "D",
  verbose = FALSE)

`dwei`	- A Datastream Client Interface object created with getDataStream
`DSCode`	- the constituent list for the request eg LDJSTOXX
`Expression`	- the data to return eg MNEM or NAME
`startDate`	- the date of the request, or the string "TODAY"
`endDate`	- Ignored
`frequency`	- the frequency of the request
`verbose`	- whether to give messages during the request