add "that was weird" button

[Brian Warner]

as Zooko suggested in ​http://allmydata.org/pipermail/tahoe-dev/2008-June/000646.html , the Incident-reporting mechanism in Foolscap ought to have a manual trigger, so application users can push a button that says "that was weird", and cause Foolscap to record an incident.

Actually, the cleanest way to do this is to simply emit a log event at the WEIRD level. Something like:

def that_was_weird_button_pushed(reason):
    log.msg(format="The user pushed the 'that was weird' button: %(reason)s",
            reason=reason, level=log.WEIRD)

Then as long as the default incident-qualifier hasn't been overridden, this will trigger the incident and its reason clearly.. no extra code necessary.

I'll use this ticket to remember that this needs to be documented.

[Brian Warner]

Done, in [355e66696bd520f47f50e802500f94bb79095c16].