#####Should the following function be exported or not? I guess you could, but then again,
#####its purpose is very specific and there is much room to misunderstand it.
#####
#' Concatenation of raw spectra in msmsWorkspace
#'
#' Concatenates the (at)specs spectra of msmsWorkspace according to cpdIDs
#'
#' @usage c.msmsWSspecs(w1, w2)
#' @param w1,w2 The msmsWorkspaces of which the spectra should be concatenated
#' @return The \code{msmsWorkspace} with the spectra of two workspaces concatenated into one. Please note that the spectra from w2 will be concatenated to w1 and not vice versa.