- adds -includeconf=<path>, where <path> is relative to datadir or to
the path of the file being read, if in a file
- protects against circular includes
- updates help docs
Backport of core PR10267
https://github.com/bitcoin/bitcoin/pull/10267/files
Includes a fix from PR13126
https://github.com/bitcoin/bitcoin/pull/10267#issuecomment-388580967