The previous code was too difficult to decipher for such a simple tool.
Since yes(1) is not specified in any standard and several well-known
implementations only support a single argument, do the same here.
Thanks to everyone who offered implementation suggestions in the
hackers@suckless.org email thread.
The one specified by mdoc is hard to read for non-native
speakers from countries which read the date day-first (like
Germany, Greece, North-Korea, Swamp,...).
This is also consistent with how we generally specify dates
at suckless.org.
- add .Os, it is mandatory.
- don't redeclare .Nm when it's not needed.
- fix some warnings (checked with mandoc -Tlint).
- remove some leftover old stuff.
