Went back to lukeroth's repo!

There are two outstanding issues on lukeroth's repo: using floats for
IO and returning non-nil errors with error code "No Error".  I sent in
a pull request for the former and have a workaround for the latter.
Constructed test files for quick test of buildMap.

The two small files are samples of real data which generate real
results and so make for an excellent test case.
Added biomes to world package.

Before I can make a biome map in the carto package, I need biomes to
be in the world package.
First attempt at classifying biomes based on other information.

Ocean, deep ocean, and plains are a good start.
Biome support, plus minor refactoring.

Biomes are now being generated and stored in the output map.

Raster checking was refactored and arrays were renamed.