The BSD /bin/echo doesn't know the option '-e'

This ensures that the whole text of a footnote has the same indentation
and not just the line following the footnote mark

The upper part of the slide is white text on dark background.
For the title graphic part it's the other way round, so switch
the text color back to black.

Simplify redundant fallbacks

Fix #261

fix \ProvidesPackage{} for highcontrast theme

Format table rules following booktabs advice