Support german notation

[Zsolt Tempfli]

It would be nice if you could add support for the german style notation.
What do I mean exactly? By default (english notation) the notes are:
C D E F G A B

in german notation:
C D E F G A H

See the difference between the two last notes: B and H. Now here are some
equivalences:

English: BESES - BES - B - BIS - BISIS
German:   BES  -  B  - H - HIS - HISIS

Actually what I am suggesting is the addition of H, HIS and HISIS (but with
this effort maybe it would be wise to add also HES and HESES, even if it is
not really correct / used).