`no_search` is a suboptimally chosen field to exclude pages from sitemap

[DenisMir]

It is a big problem that dd_googlesitemap uses the no_search field for its decision on excluding pages from the sitemap. no_search should be used for excluding pages from the page search (like the index search or solr search etc.). At the moment it is not possible to exclude pages from the internal search and include it in the sitemap and vice versa. It would be awesome if dd_googlesitemap could use a configurable field or at least a different field from no_search.