Overview of turb module

The turb module provides routines for computing properties of turbulence under local theories, including mlt (mixing-length theory), tdc (time-dependent convection), semiconvection, and thermohaline turbulence.

Usage is by writing use turb at the top of a module or routine. This imports the routines set_mlt, set_tdc, set_thermohaline, and set_semiconvection.