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This patch limits users who are not in the known-good users
list ('autopatrol') to creating 5 pages per day.
The vast majority of our spam comes from the creation of new
pages. This patch will limit the usefulness of each spammer
account, by limiting the number of pages each can create.
By setting the number at 5 initially, it is not expected to
have an impact on legitimate new users playing with the wiki
for the first time. Neither will it have an impact for many spam
accounts, but at least it provides and upper limit for cleanup.
Relevant references:
* Rate limts https://www.mediawiki.org/wiki/Manual:$wgRateLimits
* User rights https://www.mediawiki.org/wiki/Manual:User_rights
Change-Id: Iabe785fedb121a32d8adac5a490d9b5b9f40219f