Update documentation to include undocumented switches

There are a few undocumented switches (e.g. split point ratios and north/south tilt). These should be added to the documentation. Also, the paper and code/documentation should use consistent wording for skewness/distortion correction.

Start by locating the project documentation and the referenced paper, then search for existing switch descriptions and uses of “skewness” and “distortion correction.” Add the split point ratios and north/south tilt switches, and make the terminology consistent across the paper and code documentation.

Written by the indexing model from the issue text.