gulf.data: Southern Gulf of St Lawrence Data Access

#' Reference and Example Data Sets
#' 
#' @name data
#' 
#' @description These are the reference and example data used in the \code{gulf.data} package.
#' 
#' Survey fishing vessel table:
#' \describe{
#'   \item{name}{Survey vessel name.}
#'   \item{vessel.length}{Survey vessel length.}
#'   \item{vessel.weight}{Vessel weight (tonnes).}
#'   \item{vessel.horsepower}{Survey vessel horsepower.}
#'   \item{vessel.hull}{Vessel hull material.}
#'   \item{trawl.method}{Trawl method.}
#' }
#' 
#' Survey table:
#' \describe{
#'    \item{project}{Survey project ID.}
#'    \item{year}{Survey year.}
#'    \item{id}{Survey identifier.}
#'    \item{vessel}{Survey vessel name.}
#'    \item{type}{Survey type.}
#'    \item{start.month}{Survey start month.}
#'    \item{start.day}{Survey start day.}
#'    \item{end.month}{Survey end month.}	
#'    \item{end.day}{Survey end day.}
#'    \item{trawl.type}{Type of trawl used.}
#'    \item{trawl.sensor}{Trawl acoustic sensor system.}	
#'    \item{minilog}{Whether a Minilog temperature-depth probe was used.}
#'    \item{star-oddi}{Whether Star-Oddi probe(s) were used.}
#' }
#' 
#' @section \code{Minilog example.txt}: 
#' A sample Minilog text file with a header, field names, and temperature observations.
#' 
#' A Minilog text file with the following variables:
#' \describe{
#'   \item{date}{Date when the measurement was made.}
#'   \item{time}{Time when the measurement was made.}
#'   \item{temperature}{Temperature in degrees Celsius.}
#'   \item{depth}{Temperature in degrees Celsius.}
#' }
#' 
#' @section \code{species.csv}: 
#' Species Names and Codes of Atlantic fish and invertebrate species used in DFO the southern Gulf and 
#' Nova Scotia DFO science surveys.
#' 
#' A \sQuote{csv} (comma-separated) file with the following variables:
#' \describe{
#'   \item{code}{Numeric species codes used in DFO's science reasearch surveys.}
#'   \item{name_en}{English species names.}
#'   \item{name_fr}{French species names.}
#'   \item{name_latin}{Latin species names.}
#'   \item{aphia.id}{WoRMS toaxonomic coding.}
#' }
#'   
#' @section \code{species.foreign.csv}:
#' Species Names and Codes of Atlantic fish and invertebrate species used by other fishery groups, such 
#' as the North American Fisheries Organisation and the Statistical Coordinating Committee for the Atlantic 
#' Coast (STACAC).
#' 
#' A \sQuote{csv} (comma-separated) file with the following variables:
#' \describe{
#'   \item{stacac}{Statistical Coordinating Committee for the Atlantic Coast numeric species codes.}
#'   \item{nafo}{North American Fisheries Organization numeric species codes.}
#'   \item{rv}{DFO Science research survey numeric species codes.}
#'   \item{name_en}{English species names.}
#'   \item{name_fr}{French species names.}
#' }
#' 
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