GitLab

Only show local public notices in sitemap. Only do counts for them
in the sitemap index, and only show them in the notice sitemap.

- Reformat whitespace

Installer tweak to aid with IIS setup: if config.php exists, but is both empty and writable, let the installer proceed and overwrite it.

Conflicts:
	plugins/Sitemap/SitemapPlugin.php
	plugins/Sitemap/noticesitemap.php
	plugins/Sitemap/sitemapindex.php
	plugins/Sitemap/usersitemap.php

Fix memory leak in Inbox::addToInbox() (usage of raw DB_DataObject::staticGet, which leaks memory into a process-global cache).
On my test setup, this fixes inbox delivery to 10,000 local recipients from background queuedaemon running with a 32mb memory limit, completes the job within a minute from start.

We need to bundle counts of notices and users by date. This can be
expensive for large sites. So, new tables are added to cache the
results of these queries, which don't change after the date is over.