Reconcile how we address different data source types

[DrCuriosity]

Arising from review: #41 (comment)

We need some words here about reconciling our various
data sources (grids, location lists, bins).

In this library. Locations (and CodedLocations) are collected/grouped into named lists, named grids and now the new binned class CodedLocationBin. The goal is to check that the API for each of these is as homogenous as possible, i.e. same naming conventions, access patterns so that as users we're able to move between them without significant paradigm shift.