Hydro-mechanical models of EDZ formation and EDZ affected transport

Structure

apps - specific aplications with custom code, some of the code may later be moved into core library
src/endorse - core library
tests - currently both unit tests and various numerical tests

less defensive in particular various custom code
Only test the validity of inputs if you can fix if it is invalida and continue with valid structures. Otherwise fail early.
Do not test for indices and kays let them raise
try to reduce number of indentions
try to avoid conditions, use polymorphism, and 'projection' to canonic states and structures
prefer usage of numpy/xarray vectorised code for numerical code
adopt 'functional' style prefer pure functions, comprihentions, nonmodified classes
use Path instead of os.path
for any new code or touched code, prefer Path consistently; do not introduce new os.path usage unless there is a clear technical reason
avoid code duplication

Do not combine more than single targeted (single function or consistent refactoring) change in a single commit.
Do not ask me for confirmation of any changes, I will check tem in git-cola