Dedicating subdomains for tags

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This is impossible at the moment, but a basic effect might be achieved with adding the given tag to the "search state" behind the scenes in the view askbot.views.readers.questions.

I think as always - to really finish that feature, quite a bit more work will be needed:

• automatically apply tag to new questions
• make it more difficult to remove that tag - so that questions could not too easily "jump" from site to site.
• filter users by tags
• restrict "site-level tags" to just a few - because sites tend to accumulate lots of tags

Regarding categories - those are going to be based on tags - but organized into a tree. Only a few tags will ever be "category level" tags, because you don't want to have too many anyway.