BREAKING CHANGE: /sitemap.xsl is gone (404), the definitions screen and
the Phase 17 settings tile are replaced by the settings singleton, and
priority, change frequency, priority tiers and the update manifest are
no longer written or read. The config keys golem15.sitemap.cache_seconds
and golem15.sitemap.priority_tiers are removed; site_url, lastmod_ignore
and rebuild_delay_seconds are new.
- sitemap:import and sitemap:import-winter write the additional addresses
(and site_url, default_locale) instead of the definition
- the golem15_sitemap_definitions table stays in the database, unread
- one settings tile opening the golem15.sitemap.settings singleton
- Files tab (site address, file size, S1 files partial), Additional
addresses repeater, Content types tab built from signpost at boot
- golem15_sitemap_types; a type switched off leaves the files (reason type)
- a save validates (errors.*) and dispatches a rebuild after commit
