find_stablepopulations_root: Find Root Directory of StablePopulation
Description
This internal function searches for the root directory of the StablePopulation
project by looking for a folder named StablePopulation in the current
or parent directories. It is used internally to locate project-specific files.
Usage
find_stablepopulations_root()
Value
A character string with the full path to the StablePopulation directory if found. If not found, an error is raised.