Refactor the way that the rss module works so that we're not allowing

the url to dictate arbitrary static method calls.

* Each xxx_rss helper has a single feed() call which takes an id as the argument

* xxx_rss::available_feedS() only returns feeds when they're applicable (ie
  if you're viewing a tag, it won't show you an item feed).

* Feed urls are now in the module/feed_id form so that we can bind a
  feed id to a given module

* Tightened up the Rss_Controller by using url::merge and some other tricks.

* Made the slideshow module express its own feed.

Signed-off-by:  <unostar@danalan.info>

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