Fix possible problems detected via CodeQL codescanning workflow

[speters]

This fixes possible problems being detected by the CodeQL codescanning workflow.

Problems contained:

• 27 "Uncontrolled format string" (https://www.securecoding.cert.org/confluence/display/c/FIO30-C.+Exclude+user+input+from+format+strings) warnings which were caused by overly complicated use of logIT() function,
• 2 "Time-of-check time-of-use filesystem race condition" (https://www.securecoding.cert.org/confluence/display/c/FIO01-C.+Be+careful+using+functions+that+use+file+names+for+identification) problems,
• 1 "Likely overrunning write" problem caused by format string handling integer instead of char

Please be so kind as to test this version.

[hmueller01]

I think it is not good to merge a pull request right away. This way it is not possible to add more changes.
In many cases the reserved memory char string[100]; is not needed any more.
I'll pull the new master and test it. :-)

[hmueller01]

New version is running. I'll open a new PR to remove these unused string's ...

[speters]

I was solely concetrated on those easy fixes.
Shame on me. And thx for having an eye on it.

[hmueller01]

Until now it works like before. As it is already merged it can be released ;-)
Pls review #105 (I tested with this PR ...)