Configure lexibank.

    :return: a pair (config, logger)

def configure(cfgpath=None):
    """
    Configure lexibank.

    :return: a pair (config, logger)
    """
    cfgpath = Path(cfgpath) \
        if cfgpath else Path(user_config_dir(pylexibank.__name__)) / 'config.ini'
    if not cfgpath.exists():
        print("""
{0}

You seem to be running lexibank for the first time.
Your system configuration will now be written to a config file to be used
whenever lexibank is run lateron.
""".format(
            colored('Welcome to lexibank!', 'blue', attrs=['bold', 'reverse'])))
        if not cfgpath.parent.exists():
            cfgpath.parent.mkdir(parents=True)
        cfg = Config()
        cfg['paths'] = {k: get_path(src) for k, src in REPOS}
        cfg.write(cfgpath)
        print("""
Configuration has been written to:
{0}
You may edit this file to adapt to changes in your system or to reconfigure settings
such as the logging level.""".format(cfgpath.resolve()))
    else:
        cfg = Config.from_file(cfgpath)

    try:
        cfg.glottolog
    except (FileNotFoundError, ValueError):
        raise ParserError('Misconfigured Glottolog path in {0}'.format(cfgpath))
    if not Path(cfg['paths']['concepticon']).exists():
        raise ParserError('Misconfigured Concepticon path in {0}'.format(cfgpath))

    # Print the configuration directory for reference:
    print("Using configuration file at:")
    print(str(cfgpath) + '\n')
    return cfg