DirChar2Int
===========
```{function}  DirChar2Int(dir_char)
```
Full definition:
```{code-block} matlab
function n = DirChar2Int(dir_char)
```

internal function to convert a character like 'x','y','z' into a numeric
direction: 0..2!
If input already is a numeric value from 0..2, it will just be copied!
Everything else will raise an error!



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author: Thorsten Liebig (c) 2013