[Chicken-users] srfi-19 missing a few exports

[Alex Suraci]

The srfi-19 module doesn't seem to export (among others)
seconds->time, instead exposing the srfi-18 seconds->time, which for
example causes this to fail:

    (seconds->time (time->seconds (current-time)))

They're available in srfi-19-time, though that seems a bit odd given
that srfi-19 already exports e.g. time->seconds.

-- 
Alex