Dylan Wagstaff 95f0acb0f4 NEW Add support for ManyManyThrough relations
Previously relationships defiend as many_many came in a special type
of RelationList - however now this can be one of two types of
RelationList depending on the type of definition, with both being
valid many_many relationships.

This had the unfortunate side effect of seeing the OrderableRows
component in (the least) cease functioning correctly. No longer.

This also has the fortunate bonus of allowing a many_many relationship to
be versioned; where previously while each item in the relationship could
be versioned, the relationship itself could not.
2018-07-02 11:25:16 +12:00
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