First implementation, need answer https://github.com/nicolargo/glances/issues/1129#issuecomment-318489088

Remove 'glances_' prefix from filenames.

- First line should end with a period
- No blank lines allowed after function docstring
- 1 blank line required between summary line and description
- 1 blank line required before class docstring
- Multi-line docstring closing quotes should be on a separate line
- No whitespaces allowed surrounding docstring text
- One-line docstring should fit on one line with quotes
- Use r""" if any backslashes in a docstring

Support remains there, but no system-wide configuration file will be
provided anymore.

Default configuration settings are initialized by code which may be
overridden by a configuration file.