Better logging by kind

[JasonGross]

After #375, following up on #374, we should:

• move all logging over to being based on kind rather than verbosity level
• instead of passing verbose_base, passing around a kind string suffix
• have a dictionary of default verbosity levels for all the kinds, which is used to decide which kinds are logged by default when a given verbosity is set, so that current logging behavior remains unchanged
• have a special dict of "does logging kind k1 include logging kind k2". "all" should be defaultdict(lambda: True), others should be defaultdict((lambda: None), ... stuff included). If a file is tagged with one of these kinds, any kind that is included in that kind should be logged to the file, unless explicitly disabled.