rhg: Add more conversions between error types
This allows using the `?` operator in more places, as the next commit does.
Differential Revision: https://phab.mercurial-scm.org/D10238
// config.rs
//
// Copyright 2020
// Valentin Gatien-Baron,
// Raphaël Gomès <rgomes@octobus.net>
//
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.
//! Mercurial config parsing and interfaces.
mod config;
mod layer;
mod values;
pub use config::{Config, ConfigValueParseError};
pub use layer::{ConfigError, ConfigParseError};