schemas/public_.sql: iucn_red_list_view: documented how to regenerate iucn_red_list from this

bugfix: schemas/public_.sql: 2014-6-4.Iara_Lacher.reserve_prioritization: fixed slowdown in materializing the view, which was caused by source__observation_type(), by replacing this with a LEFT JOIN as was done for is_threatened_iucn

schemas/util.sql: in_south_america(): optimized by using BETWEEN instead of util.contained_within__no_dateline(). this reduces the filter time for 2014-6-4.Iara_Lacher.reserve_prioritization by about 10%.

fix: schemas/public_.sql: 2014-6-4.Iara_Lacher.reserve_prioritization: is_threatened_iucn: generate this much faster by doing a LEFT JOIN, which can reuse the same in-memory hash index for every row

bugfix: schemas/public_.sql: wrapper functions can't use util-schema types because these will cause the wrapper function to be cascadingly dropped when the util schema is reinstalled

bugfix: in_south_america(): must use util.contained_within__no_dateline() instead of util.contained_within_approx() to ensure that the more accurate geometry logic is used

bugfix: schemas/public_.sql: source__observation_type(): don't display NOTICEs about the search_path, because this function will be called millions of times

bugfix: schemas/public_.sql: in_iucn_red_list(): don't display NOTICEs about the search_path, because this function will be called millions of times

schemas/public_.sql: 2014-6-4.Iara_Lacher.reserve_prioritization: added is_threatened_iucn

schemas/public_.sql: added in_iucn_red_list()