InitialiserList, *Stream++, Orbis index alloc++

- ozCore
  * std::initializer_list ~> oz::InitialiserList, initialiser list constructors
    for containers
  * OZ_SIZEOF_LONG macro
  * *Stream: readBitset()/writeBitset(), complex functions moved to .cc
- matrix
  * Orbis
    + freed index lists removed, indices are allocated incrementally, freed ones
      are tagged in bitsets to be skipped
    + nStructs(), nObjects(), nFrags() removed