Main book: Update link to ulComplexPianoScores

Due to the directory restructuring the link to the tutorial in the tutorials book was wrong
Add (empty) README
tut: Fix \setbookmaintitle

The main title of the Tutorials book wasn't updated to the new bookpart syntax
Set up ulPlainTextWorkflows.tex
ulPlaintext: Add to main book
ulPlaintext: define ulStyles.sty

This is a style sheet with commands defined during the development of this
tutorial.
Items have to be integrated in the main base sheets afterwards

Add (diff) listings
add listings language=diff to ulStyles.sty

Update \lstset

Make listings coherent through a \lstset command
in ulStyles.sty
tut: ulPlaintex: Add CHANGES.md example

Example file for Markdown
tut: ulPlaintext: update CHANGES.md example file

Update used to describe a Git diff
ulPlainText: Start outline

... until and including LilyPond/LaTeX integration
ulPlainText: WIP (formulate sketch)

Start writing complete text from outline (-- introduction)
tut: ulPlaintext: WIP

Description of Markdown and Git introduction
tut: ulPlaintext: WIP (Esslingen)
tut: ulPlaintext: WIP

Small modifications in 1 and 2,
start with 3 (LaTeX)
tut: ulPlaintext: WIP

refine outline of LaTeX chapter
tut: ulPlaintext: WIP

Tiny bit of LaTeX chapter
tut: ulPlaintext: WIP

Continue LaTeX chapter
tut: ulPlaintext: WIP

Major portion of the LaTeX chapter
tut: ulPlaintext: finish outline sketch

Have got through the whole paper sketch and done one first outline.
This is mainly targeted at the written tutorial with some ideas only useful for the Karlsruhe presentation
tut: ulPlaintext: Finish sketch of LaTeX chapter
tut: ulPlaintext: WIP

Start LilyPond chapter