- classes.SiteCachePurger, NewSiteCachePurger, PurgeSiteCacheAfterCommit and
the key and limit constants stay as deprecated aliases for one release
- wireSiteCache: framework keys site_cache.* win (Journal keys ignored with
a warning); with only golem15.journal.site_cache.* set it publishes the
purger from them with a deprecation warning, so menu and FAQ saves purge
through it too
- controllers take the purger from cooler.SiteCacheFromApp
- TestSiteCacheFrameworkKeysWin; README documents both key sets