* Evergreen master
The sitemap generator currently only generates "dates modified" values corresponding to the date the underlying bib record. However, it is often advantageous to be able to set a minimum date floor to reflect that, for example, the catalogue was enhanced to include more detail, even though the underlying MARC record itself might have changed. Thus, add a --date-floor option for the command line, and fall back to a reasonable default of 2010-01-01 in the absence of any value.
Also, the list of bib record IDs was limited to those contained in asset.opac_visible_copies. However, that leaves out located URIs, of which there may be many, and which search engines love to serve up. We need to adjust the search query accordingly to not leave out any records of note.
See http://