[Implemented] Wiki banners

[Phil Bull]

Hi guys,

We reached a consensus last week [1] that the basic Include()-based wiki
banners should be used to mark pages on the wiki. I've now implemented
these banners [2] and they are ready to use (as far as I'm concerned, at
least). Feedback is welcome.

I thought it would be best to rename them "Tags", since it's less prone
to being misspelled and describes their function better.

Thanks,

Phil

[1] -
https://lists.ubuntu.com/archives/ubuntu-doc/2008-August/011337.html
[2] - https://help.ubuntu.com/community/Tag

-- 
Phil Bull
http://www.launchpad.net/people/philbull