bandwidthd - code style and major improvements

- Update copyright headers
- Fix code style and indentation

- Provide input validation for most of the configuration options
-- Check for IPv4 configured on selected interfaces
-- Check for PPPoE type interfaces
-- Require relevant options to be filled in when PostgreSQL is enabled (also check that the hostname is valid)
-- Require sane numeric input for graphs options
-- Limit Sensor ID to sane chars

- PostgreSQL DB password is now base64-encoded to deal with special chars and not break config.xml
- The filtering moved to advanced options, also base64-encoded
- The stats interface(s) are now a multiselect instead of asking users to type subnets directly
- Upgrade function provided to preserve the old settings
- Use {start,stop,restart}_service() functions instead of calling the rc script directly
- Probably other small things...

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