Headings
Chapter number and chapter (short) title in the head. (default is chapter (left) and section (right)).
@ute.schmid wants page numbers in headline. Discuss?
We would include this in the class directly.
Current version done by Thomas Sedlmeir:
\usepackage[headsepline]{scrlayer-scrpage}
\pagestyle{scrheadings}
\clearpairofpagestyles
\ihead{\headmark}
\automark{chapter}
\ohead{\pagemark}