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a14924a999
* Using [`GLib Logging Framework`](https://developer.gnome.org/programming-guidelines/stable/logging.html.en) for logging * Created new `g_logger` function for logging * Outputs to `stdout`/`stderr` only when running in `foreground` * `stderr` for `message`, `warning`, `critical` & `error` levels * `stdout` for `debug` & `info` levels * Use `G_MESSAGES_DEBUG=all` environment to enable `debug` to print * Otherwise, output will be to `syslog` or `systemd journal` (when appropriate) * Standardized usage of `{LOG_PRIORITY}: ` prefix in log messages * Only when using `syslog`, otherwise `GLib Logging` will take care of it * Changed `fprintf(stderr`, `printf` & `perror` calls to `g_logger` calls * You might want to check them out closely to make sure I chose the right levels * No changes to `logging/output` were made to "`foreground`" programs (I.E. `render_*`) * Changed `0`,`1` to `no_argument`,`required_argument` in `getopt_long`'s `long_options` * Fixed `renderd`'s `foreground` opt (should be `no_argument` [0] rather than `reguired_argument` [1]) * Basic test for `mod_tile` module * ~~Extended `renderd` log priority onto Mapnik's logger~~