Some optimization improvements. Potential memory leaks to look at. Many improvements in the preprocessing scripts, almost finished the parcel mode. New scripts in the prostprocessing directory. Changes in the samir parameter handling.

Added main_run_samir.py to run the samir model. Modified config_file to manage input paths. Various bug corrections in dataset dimensions, speed improvements with parallel processing parameters. Added a notebook in postprocessing to plot pixel model outputs.

Fixed equations, deleted some temporary variables to reduce memory usage, used eval() function to improve readability.

run_samir() operational. Outputs are not yet valid, updated dev_samir_xarray.ipynb for comparison with modspa excel and added validation inputs and outputs for comparison.