Check if directories exist

Merged Sebastian Müller requested to merge muellese/mhm:check_dirs_exist into develop

This merge request introduces a module for sanity checks for the input data: mo_checks. First subroutine: check_dir

All input directories are checked for existence. A "(found)" is added in the printout. If a file-prefix is added by the output-directory path, this is highlighted (as done with the check-cases).

Fixes #140 (closed) Fixes #95 (closed)

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