WORKING

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# Working issues
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- Update copyrights with standard header.
- Add context interface for adjacency information.
- Add functional form for specialization tlt initialization.

- Check context header dependencies (Circular? How does this work?)

- Enable CLOG_MPI if MPI_ENABLE is on.

- Adding blender
- Define subset index spaces
- Fix futures

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- Make macro interface self-contained -> users don't need to use the
  flecsi namespace.

- Add new permissions:
  na - no access / not applicable
  ro - read only
  wo - write only
  rw - read write

  Also fix behavior in task mappings

- Add index sub-spaces
  all
  exclusive
  shared
  ghost
  owned

- Determine whether or not ghost copies are per variable

NOTE: Currently, we cannot accommodate communication latency hiding because
we do not have an implementation of the na permissions.