One switch in Settings > Clock adds seconds to the home readout and
every city row, in the same 12/24-hour and locale form as before, and
gives the analog face its second hand. Off by default.
The tab now ticks on the wall-clock boundary through a new
Ticker.alignedTicks: once a minute with seconds off, once a second only
with them on, replacing the free-running 200 ms tick. The setting is in
backups as world_clock_show_seconds; older files import with it off.
Fixes#23
makiolaj
785adf715b