* Update rules list view to show global rules toggle, global rules
* Update rule processing to get global rules from memcache, if no
rule exists, get them from the central database and store them in
memcache
* Delete global rule key whenever global rules are updated
* Add filtering for log by wiki on the central database, updated
table definitions to add index on afl_wiki
* Add global $wgAbuseFilterDisallowGlobalLocalBlocks so local wikis
can prevent global rules from locally blocking, removing or revoking
permissions.
* patchset 13: Include recommendations from Tim. Add db updates to
LoadExtensionSchemaUpdates hook.
* patchset 14: forgot to add new files
Change-Id: Id69a9d603f9679f838e8691c651a3e9d8461b422