- consistent constructors and consistent behaviour with MUST_READ,
    READ_IF_PRESENT

  - setSize(const label)
    * When the new size is greater than the addressed list size, the allocated
      list sizes is adjusted and the addressed size does not change.
    * Otherwise the addressed list size is just reduced and the allocated
      size does not change. inline void setSize(const label);

  - setSize(const label, const T&)
    Disabled, since the usefulness and semantics are not quite clear

  - operator=(const T&)
    should not affect the allocated size (BUGFIX)