3183 - cleanup

- New plan
Primitives:
  $open-file-for-reading
  $open-file-for-writing
  $read-from-file
  $write-to-file
  $close-file

The '$' prefix indicates that none of these are intended to be used
directly since they rely on type-system-busting numbers. Also that they
are just temporary hacks depending on primitives provided by the host
system. A putative 'Mu machine' would have very different primitives.

Testable interfaces:
- start-reading: starts a routine to read from a file and returns the
  source where the contents will become available.
- start-writing: starts a routine to write to a file and returns the
  sink where the contents can be provided.

Both operate on the real file-system if the first 'filesystem'
ingredient is 0.

Once you start them up you can read/write/close the channel as usual.

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