data: filter only requested deps, require requesting 'this'

* Thing.composite.from() only provides the dependencies specified
  in each step and the base, and prevents '#'-prefixed keys from
  being specified on the main (composite) dependency list.

* CacheableObject no longer provides a "reflection" dependency to
  every compute/transform function, and now requires the property
  'this' to be specified instead of the constructor.instance
  symbol. (The static CacheableObject.instance, inherited by all
  subclasses, was also removed.)

* Also minor improvements to sugar.js data processing utility
  functions.

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