- `database_reader.c`: Adjust error handling by consistently using `error()` with `defer_return`.
- `database_writer.c`: Harmonize error handling by implementing `error_system()` where appropriate.
- `error.c`: Modify error messages for clarity by restructuring `fprintf`.
- `expect.c`: Add `error()` wrapping for improved error reporting.
- `hmm_reader.c`: Standardize error handling using `error()` utility.
- `hmmer.c`: Consistently apply error handling modifications across setup functions.
- Various files: Utilize consistent error handling pattern with `error()` for enhanced debugging.