Datasus-commons

- Reorganizing metadata extraction from ftp lines
- Customized regular expressions for metadata extraction

- Reorganizing DBC and DBF file conversion
- Supports to DBF7 via dbfread package
- Fix lower or upper extension on conversions

- Improvements in conversions
- Improvements in filtering functions
- Improving grouping of ftp entries
- Reorganizing modules

- DBC to DBF conversions
- DBF to CSV and parquet conversions
- Copy Interface and Local Copier implementation

- Fixing FTP utilities errors
- Ingestion functions about FTP repo DATASUS downloading
- Metadata and infromation ftp management
- Distribuion package release

- Volumetry and metadata utilities
- FTP download utilies
- Metadata reports of SIA and SIH Datasus systems