added Antarctica but getting error when running and warnings with CheckLayers():

```
Scenario: Antarctica2013.a2014 -> antarctica2014

Google spreadsheet editable URL:
  https://docs.google.com/spreadsheet/ccc?key=0ArcIhYsFwBeNdHNxNk1iRHc1S05KLWsyb0ZtZjRjZnc

Error in gsub(lyrs$layer_old[i], lyrs$layer[i], s, fixed = T) :
  input string 8 is invalid UTF-8

Warning messages in CheckLayers():
 1: Unused fields...
    eco: sector
    hab_extent: habitat
    hab_health: habitat
    hab_trend: habitat
    le_sector_weight: sector
    rgn_area: ccamlr_id,sp_id,sp_name
    rgn_global: ccamlr_id2,ccamlr_id,sp_id,sp_key,rgn_name,rgn_key

  2: Rows duplicated...
    eco: 64
    hab_extent: 19
    hab_health: 19
    hab_trend: 19
    le_sector_weight: 19
```