A code listing should be treated as verbatim with high-lighting.
Enabling LaTeX commands makes the exam-print-script susceptible to
faulty LaTeX code the student may have added to his code. (For example
to make his plots look fancy.)

Additionally I'd prefer to see the code. Not how the code would be
rendered if one ran it through LaTeX.

Sort the LST options and remove duplicated options.

This reverts commit 9abc403f.

Revert "Merge branch 'F_branch' into 'master'"

See merge request !3

This reverts commit 916658be

# Conflicts:
#   header.txt
#   latex_creator.py