Versioning of binaries

[dennisguse]

At the moment, some binaries provide hard-coded version information.

noname:~/STL/src/utl$ ../../bin/spdemo spdemo.c - version 3.2 of 02.Feb.2010

However, this information needs to updated manually, which is an error-prone and manual process.
It would be better to generate the version information automatically.
Solutions:

• use release identifier (for released versions): e.g., STL2018
• use hash of last git commit: e.g., dc0efab
• use hash of last git commit a file was changed (might be difficult considering includes)