Merge pull request NCAR#11 from mariajmolina/main

Currently, the directories for save_path, error file (batch job script), and output file (batch job script) have to be updated for different echo/optuna studies, creating possible workflow failures  if minor typo is made. This update allows us to just set the error file and output file names to something like "out" and allow echo to append it to the already defined save_path.