A feature to select chord inversion style

[Henrik Pitkala]

I'd like to select how the chord inversions are printed: whether to use
accidentals or not, and whether to use capital or minor letters in the
inversion letters. This applies mostly to \germanChords, but why not to the
other modes, too.

For example, this code:

\version "2.19.6"
\chordMode {
        \germanChords
        c:m  c:m/es  h:m/fis  b/as
}

gives this output:

  Cm  Cm/es  Hm/fis  B/as


But I would like to have a possibility for the following output with
accidentals:

  Cm  Cm/eb  Hm/f#  B/ab

Additionally, if I'd select to use capital letters, I'd get this output:

  Cm  Cm/Eb  Hm/F#  B/Ab


Suggestion for commands to achieve these:

\set chordInversionWithAccidental = ##t
\set chordInversionWithCapitalLetter = ##t


This LSR snippet is related:
http://lsr.di.unimi.it/LSR/Item?id=750