dctool: exporting dives to csv

[Kristaps Dzonsons]

> I am Simon and i I am a blind diver.
> Unfortunately i can't see whats on my dive computer.
> So i plan to use it as a kind of logger or blackbox.
> unfortunately most of the applications which are coming with dive
> computers aren't much accessible to blind and visually impaired people.
> so i thought it might be interesting to use dctool to get the data out
> of the computer.
> i currently don't have a dive computer but i might get a suunto zoop novo.
> can i export dive data to csv or other format using dctool?
> i know that the computers measure all their parameters every few seconds.
> can i get that data out as well?
> so i can see how fast we where going down and do my own statistics.

divecmd (https://kristaps.bsd.lv/divecmd) is built atop libdivecomputer
and has all sorts of ways of sifting through data.  Including a simple
tool for converting to CSV.  (Though the XML produced by default is
well-documented.)  I used dctool as a starting point for it.

It's UNIX only, however, and mostly built for freediving analysis.

Works for libdivecomputer 0.6.0, though I'll need to retool it somewhat
for the coming version.  (And will patch the manpages whilst doing so... ;))