ch2: lilypond-custom: Initial score wizard

Go through the Frescobaldi score wizard, fill everything there.
No manual check apart from the preview function.
ch2: lilypond-custom: Add piano centered dynamics

It seems the score setup wizard does not support this
so I had to manually write a piano centered dynamics context

-> open an issue at Frescobaldi!
ch2: lilypond-custom: Adjust initial settings

fix a few things from the wizard and add a first measure
for all voices, just to see everything works correctly.
ch2: lilypond-custom: music entry: accid. style

Set accidentalStyle to 'piano'
This is part of basic score setup IMO
ch2: lilypond-custom: Music entry r.h.

I will have to switch several accidentals which aren't
aligned as in the model (Henle).

And I will have to take care of the reminder accidentals.
Obviously they aren't used accordingly.

But I'll have to recheck against the used edition (Clara Sch.)
as I copied from Henle.
ch2: lilypond-custom: Music entry l.h. two
ch2: lilypond-custom: Add missing tempo mark
ch2: lilypond-custom: music entry l.h. one
ch2: lilypond-custom: revert the two manual dirs

I had done two manual directions already.
But we want to see how it does out-of-the-box.
ch2: lilypond-custom: music entry: dynamics

The piano centered dynamics make the score quite ugly
ch2: lilypond-custom: music entry: initial PDF

This is the _very plain_ music entry with LilyPond
2.19.1 latest master.

I think that particularly the piano centered dynamics made
it quite ugly.

Next step is to check against the Clara Schumann score,
as there are plenty of differences.

Then I'll have to fix directions of markup, a slur and several
articulations.

Then check the reminder accidentals.