Configpile

Refactor

- major refactoring of the processing back-end

BREAKING CHANGE

- There are breaking changes but they are too numerous to describe.

Fix

- **config**: enumerate commands in usage information

Refactor

- **config**: INI configuration file parameter is now named "config"
- **config**: removed dead code

BREAKING CHANGE

- Config.ini_files is renamed to Config.config

Fix

- do not ignore default parameter values anymore

Feat

- **config**: implement help command flag

Fix

- **util**: fix bug in attribute documentation lookup