Integrator first pass -mostly stub data and design docs.
Musings and examples.
More on aggregations / groupby.
Research
Last bit of modeling notes.
Clarified unidirectional associations.
Stub tests.
Notes.
More tests.
Left outer join works.
Check that properties exist-- leftOuterJoin tested and working by itself.
Made partial_leftOuterJoin so that the relation mapper may be called on a per-instance basis and may be operated by a stream.  The stream operator can exist separate from any one in-memory relational operation based on declarative dependencies of our operation= that it is O(L*R) and each L is dependent on all the 'right' (aka child, or R) joins.
Fixed tests and algorithm to work as an outer, rather than an inner, join.
A bit more exposition on limitations of streaming computation of joins, and added a caveat about memory-usage optimization for in-memory joins.
Moved out unused code/documentation.
Extrapolated partialJoin.
Halfway-done fixing integrator.
Before pivot in approach...
Use parent/child notation in leftOuterJoin, but tolerate left/right usage.
in-memory populate works