[dal segno / da capo] -> "Kopf" "Kopf"

[Werner]

Hello,

I was looking for quite a long time till I found

\mark \markup { \musicglyph #"scripts.coda" }

1.: In german this symbol is often called "Kopf" so this should be mentioned in
the glossary.

2.: There could be an example for a dal segno al Ø-Ø in the NR.

3.: I have some questions about this:

The \mark \markup { \musicglyph #"scripts.coda" } command I can place after a
\bar "||" an its printed above.

But unfortunately I cannot put \bar "||"_\markup { \italic \bold {{d.s. }}}. 

So I have to add the _\markup to a note instead of to the barline.

When I write several voices and put them once in one file, once together in a
Staffgroup, I would like to optain the Symbols (segno an coda) only once (above
the StaffGroup) and also the "d.s." only once (beneath).

How to obtain this?

It would be nice to have a possibility to put ^\mark \markup { \musicglyph
#"scripts.coda" } and _\mark \markup { \italic \bold {{d.s. }}} to the same \bar
"||"