process_solution converts a single zipped PLEXOS solution into a SQLite database.
The resulting database file has a simplified structure so data can be retrieved easily.
The temporary database contains the original data structure in the PLEXOS solution file.
process_folders is used to process an entire directory. It searches each folder for
PLEXOS solutions and applies process_solution to each one of them.
The default folder is the working directory. If the wildcard "*" is provided, all
the folders in the working directory will be processed (the list of folders if provided by
the list_folders function).