Refact: Improvements on Id handling in classes Id and Instance #986

[detlefarend]

No description provided.

[detlefarend]

Hi guys, I unified and extended the handling of ids and time stamps of Instances. Issue #987 changed the following things on an instance:

• the id of an instance can now be accessed (read/write) directly like inst.id = 5
• the time stamp of an instance can also be accessed directly like inst.tstamp = timedate.now()
• an instance has now always a time stamp. It is equal to the id if not set explicitly to a real time stamp

[steveyuwono]

Hi Detlef,

I have tracked the files changed. Other than failing on unit test under Python 3.12, it looks good to me.