first revision of sundial

Works with current uploader code, not yet modified to include needed tideline functions.

@jh-bate or @cheddar please review. @cheddar would like me to merge and tag this and have the uploader depend on it before merging the uploader branch where I've removed the moment dependency and replaced it with sundial methods.
How about adding one line

> UTC offsets are time ~from~ UTC and that is what we use.  Some libraries expect the inverse of an offset ~to~ UTC, which we do not use.

Or something like that?