This adds a seeded randomization step to the population warping test,
just so I can be more confident that this function is doing what I
expect it to do with more reasonable data. It does, which I'm happy to
see.
RE:#722
This adds the callthrough for the population raster resampling function
and also asserts that the outputs are reasonable for what we're trying
to do. Initial results look like that at least in this basic test we're
getting numerically sensible results. RE:#722
The function provided is a first stab at resampling/reprojecting a
population raster by way of converting to a population density, then
reprojecting and converting back to a population count. Correctness has
yet to be determined, but this way we should pretty reasonably be
preserving the population counts. RE:#722
James Douglass