Resolve "Config-file parsing order"

Release notes

Including config files from another config file works recursively now. Options set in the parent config file take precedence. Parsing TQFolders is not supported anymore.

If both dataFileList and dataPaths are defined in the initialize config, dataFileList is given precedence (it used to be the other way around).

Details

Options are propagated from included config files to their parent config file according to the following rules:

• Options in the parent config file always overwrite options in an included config file.
• If two included config files set the same option, the first one takes precedence.

Closes #161 (closed)