* plugin-runner.c (add_environment): Override existing environment variables when asked to do so. All callers changed. (main): Removed old argp.args_doc string. Parse argument file before normal command line arguments. Use ARGP_IN_ORDER flag in both calls to argp_parse. Do not strdup() strings to be sent to add_environment().
* plugin-runner.xml (OPTIONS): Document "--global-env" and "--envs-for". (FILES): Note that the config file is parsed before the command line options.