API: Allow finding log events and links to special pages
Log events are sometimes attributed to a special page; it should be
allowed to use rcnamespace or lenamespace to filter for these.
It's also possible for special pages to be the targets of redirects, so
list=allredirects and prop=redirects should find them.
Maybe someday we'll record links to and transclusions of special pages
too (see T19597), so we may as well make it possible to query for those
as well via list=alllinks, list=alltransclusions, list=backlinks,
list=embeddedin, prop=linkshere, prop=transcludedin, prop=links, and
NS_MEDIA has similar considerations: although we currently "normalize"
page links to the corresponding File and I don't think anything logs the
Media title rather than the File, transclusions and redirects do show
up in those tables.