Analogously the commands \sl, \it, and \sc are
used to switch to the shapes `sloped', `italic' and
`smallcaps', this time leaving family, series, and size alone.
In addition, we introduce the \normalshape command, in case
one wants to switch back to the `normal' shape. If font changes
are done only inside of groups this command is necessary only to
reset a shape in a footnote or a similar context to avoid the
problem mentioned above.