legacy use of "normal_na"

[cmahony]

There are quite a few references to "normal_na". can this be updated to refmap_climatena? main issue is that we notify users of "Downloading new data from normal_na..." which uses outdated terminology

"normal_composite" has been stripped from everything except tests.

[cmahony]

e.g., wouldn't it be simpler to use refmap_climatena throughout?

  needDownload <- TRUE
  if(reference == "refmap_climatena"){
    rmap_nm <- "normal_na"
  } else {
    rmap_nm <- reference
  }