doc-addition: the full lilypond command line with options+redirections

[-Eluze]

to make everything (?) clear about the command line invocation it would be
nice to to add the following in the chapter of AU (changes are italic):

1 Running lilypond
1.2 Command-line usage
Invoking lilypond

The lilypond executable may be called as follows from the command line.

lilypond [option]... file...[[1]>file.log] [2>file.txt]

then in the end of that chapter:

if [[1]>file.log] is specified, the log will be directed to that file
if [2>file.txt] is specified, special output e.g. from \displayLilyMusic or
\displayMusic is directed to file.txt

are there more procedures that direct their output to that file?

if you feel this is overloading the simple invocation used before this could
be added at the very end of this section.

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