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main.cc: Show '-d=no-foo' in help screen (#2814)

Werner Lemberg requested to merge dev/wl/dhelp into master

This commit makes the output of 'lilypond --help' look like this:

...
-d, --define-default=SYM[=VAL]   set Scheme option SYM to VAL (default: '#t')
-d, --define-default=no-SYM      set Scheme option SYM to '#f'
-d, --define-default=help        show help for Scheme options
...

Closes #2814 (closed).

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