pim: a caldav backend, and a partstat that refuses to lie

caldav/fs is the second backend, and it cost ~330 lines: discovery,
a report for the window, ETags to decide whether anything moved. The
event model, recurrence expansion, the tree, ctl, query, alarm and
changed all came from lib/cal untouched, which is what the split was
for. go-webdav hands back *ical.Calendar from the same library lib/cal
parses with, so FromCalendars takes it straight in.

Two interfaces, both optional. Identity says whose calendar this is,
because in iTIP your identity is the mailto: in your own ATTENDEE line
and nothing else can tell which attendee is you. RSVPer says the
backend can answer an invitation -- meaning both halves of it, updating
your copy and telling the organiser. A backend that can only do one
should not implement it, so partstat is 0444 on a published .ics and
writing to it fails rather than half-working.

Two bugs worth naming. go-webdav resolves paths with path.Join, which
drops a trailing slash: pointed at /dav/ it asks about /dav, and Cyrus
answers 405 for that spelling and 207 for the other, so the first
PROPFIND is done by hand. And an absolute DAV href replaces the
endpoint's path rather than extending it; appending gave
/dav/dav/calendars/..., a 404, and a probe reading 404 as "no" hid
calendar-auto-schedule, which fastmail does in fact offer.

pimup brings mail and the calendars up and mounts them; riostart runs
it before opening any window, since a mount only exists in the
namespace that made it. rio does not run riostart by itself: it is the
argument to -i.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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