Improvements for secretary

[DonMischo]

• 2 digits in filenames
• students names in the end, strip special characters
• add class at the end of merged pdf

[ArchibaldBienetre]

@DonMischo this is not enough information to implement.

1. As far as I know, digits in filenames should already work - or will they carry semantics (like, the "Klasse")?
2. "strip special characters" - it's a wide field, what do you need there, exactly?
   • Unicode normalization?
   • Restrict to a specific set of characters, because you don't have a font that supports all?
   • Shouldn't we go looking for a better font, then? ("no tofu" comes to mind)
   • Escape characters that have semantics in TeX?
   • I should have thought of it earlier ... https://xkcd.com/327/ d'oh! :facepalm:
   • Trim away whitespace from the strings (front and back)
3. so, we add a default .tex to the end of every rendered bundle?