GOMS scientific component

Scientific model: Xiaowen Li and Alan H. Strahler (1992), DOI 10.1109/36.134078.
The supplied C implementation does not identify its implementation author or
include a redistribution license. The RSPhysics maintainer has confirmed
authorization for public distribution of that code and adapted implementations.
This project-specific authorization does not relicense the original C program
under Apache-2.0 or assert an unrestricted redistribution grant for it.

The original C program is not bundled. Its reference results, source checksum,
and the explicitly documented overlap-area correction are retained separately.
RSPhysics-authored interfaces and packaging are Apache-2.0.
Questions: https://github.com/jianboqi/RSPhysics/issues
