fishPifct: fishPi functions

#' Reference table for the vessel type
#'
#' Predominant fishing gear as used in the DCF fleet segmentation:
#' This should be unique for each vessel. 
#' The dominance criteria shall be used to allocate each vessel to a segment based on the number of fishing days used
#' with each gear. If a fishing gear is used by more than the sum of all the others (i.e. a vessel spends more than 50 % of
#' its fishing time using that gear), the vessel shall be allocated to that segment. If not, the vessel shall be allocated to the
#' following fleet segment:
#' (a) 'vessels using Polyvalent active gears if it only uses active gears;
#' (b) 'vessels using Polyvalent passive gears if it only uses passive gears;
#' (c) 'vessels using active and passive gears.
#'
#' @format A data frame with 3 variables and 13 observations.
#' 
#' @source \url{http://datacollection.jrc.ec.europa.eu/wordef/fleet-segment-dcf}
#' @examples
#'   \dontrun{
#'	print(reftabletype)
#'   } 
#'
#' @name reftabletype 
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