This is a general cleanup MR.
In this MR the non-acsii charactes are removed from the *.cxx, *.h and *.f files.
The search fro files with non-ascii (almost) characters was performed with:
find . -type f -not -path "./.git/*" -name "*.h" -exec grep -lP '[^\0-\x7f]' {} \;- Most of the replaced characters are in comments and originate from a copy-pasted documentation (e.g. from PDF files).
- Some are just math symbols greek letters/umlauts/ characters with grave/acute accents, etc.
- Some charactes are "special empty spaces" or quotes.
- Virtually all the occurances are in the comments. Some exceptions are attempts to cout:: greek letters.
The author names with umlauts/grave/acute accents were left "as is".