EXA: Offscreen memory eviction improvements.

* Make sure available areas are considered to have no eviction cost. This seems
  to help for https://bugs.freedesktop.org/show_bug.cgi?id=15513 but I'm afraid
  that may just be coincidence.
* Only calculate eviction cost of each area once for each eviction pass.
  Safeguard against potential (though unlikely) division by zero.
* Cosmetic enhancements: Name eviction cost related variables 'cost' instead of
  'score' to emphasize that smaller values are better, update Doxygen file
  comment to the way eviction works now.

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