Clock with days split into decimal based units 

This is implementing a time system where the day is split into decimal units. 
For ease of use, each of the "hours", "minutes" and "seconds" have 2 digits, 
which use their full value range. This means, a day has 100 hours (0..99), 
an hour has 100 minutes, and a minute has 100 seconds. The second in this 
system is about 1/7th of a second in the standard system, allowing for more 
precision right away, without having to resort to fractional seconds. Also,
cent-hours are about a quarter standard hour, which is a good interval. Note 
how most meeting and TV schedules currently use 15 minute increments. This way
a meeting or TV show can take up 1, 2 or 4 cent-hours, and it will be easier 
sequence different meetings or programs or different lengths.

The units are:
- cent-hour: 1/100th of a day (864 standard seconds, or 14 min, 24 sec)
- cento-minute: 1/100th of a cent-hour (8.64 standard seconds)
- cent-second (or simply "cent"): 1/100th of a cent-minute (about 1/12th of a standard second)

Idea and implementation: Christian Wolff, 2017-02-10