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      ``decipher`` function to be used to determine the type member value
      from the variably typed member value. If the type of the variably
      typed member value provided during instantiation, packing, or
      attribute set is not one of the types in the ``mapping``, the
      ``decipher`` function gets called.

    - Expose :class:`plum.structure.Varies` class as public which is useful as a
      the :class:`Member` class ``cls`` argument as a descriptive placeholder.
    - Structure member protocol improved to perform "touchups" of associated
      member when variable member is assigned via an attribute set. Specifically:

        - :class:`DimsMember` values update when :class:`VariableDimsMember` set
        - :class:`SizeMember` values update when :class:`VariableSizeMember` set
        - :class:`TypeMember` values update when :class:`VariableTypeMember` set

clean up structure type construction

start supporting "free" packing with boost

show true offset in dumps of view (just in dump requests)
improve view tests for representations

Improve pack and dump support.

See merge request dangass/plum!33

Add benchmark comparisons.

See merge request dangass/plum!23

Add string type.

See merge request dangass/plum!18

Resolve "Move BitFlags to separate namespace"

See merge request dangass/plum!9

and rename