Allowing -H to extract all defined header fields

[Michael Haynie]

The attached small patch has the effect of causing 'lilypond -H all' to write out every field that appears in the header block of the score being processed. This is useful for constructing various types of indexes, such as the metrical index, composer index, and tune index common in hymnals.

2006-04-09  Michael Haynie  <[EMAIL PROTECTED]>

        * scm/backend-library.scm (output-scopes): Support extracting all
        defined header fields via '-H all'

Code making heavy use of this feature will appear in a separate patch, since it deserves some discussion.

patch
Description: Binary data

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