disaggregation functions

[sastoudt]

Functions for breaking geographic units into different geographic units and recalculating quantities of interest [with and without margin of error].

• sums
• medians
• means

[sastoudt]

Proof of concept for sums here.

Means is still in progress, was only accounting for margin of error in n, not val.

[sastoudt]

Means proof of concept done at above link.

This approach will need some specific tests/checks and additional inputs from the current census aggregator outputs.

[sastoudt]

Medians proof of concept done at above link.

Now needs a plan for integration with census aggregator and checks/tests

[sastoudt]

Added warnings for some checks and some documentation