Implement --debug and --trace, adding to --verbose. #97
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Some users are confused by the Unix way of using -vvv to mean “very, very verbose” and accumulate verbosity that way. Introduce --debug as a synonym to -vv and --trace as a synonym to -vvv.
The only drawback to also implement --debug and --trace when we could use --verbose several times is to use yet another short option letter. It seems to be worth it given the user feedback though.
Also introduce a new log level NOTICE between INFO (default verbosity) and DEBUG (extra verbosity) so that we have a new verbose setting that makes sense. The log_notice() macro isn't used much as yet, following patches and PRs will introduce more usage for it.