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Print out header fields as PDF metadata; Add simple markup->string function
-) Create DOCINFO pdfmark, with the metadata fields extracted
from the \header block
-) Add scheme function markup->string that extracts and returns only the
string part of a markup. As all header fields are possibly markups,
we need to call this function on the header fields and use only
the string representation (formatting and possibly some information
lost!) as metadata.
This function is very simply (for all known text markup functions,
it extracts the text and ignores the formatting, all other markup
functions are entirely ignored), so it might not work perfectly
for complex markups.
-) Add possibility to override a header field with the same name, but
a pdf prefix, to force a particular metadata string, which is not
displayed in the pdf. E.g. if the \header block contains
pdftitle = "Title for pdf file"
then that pdftitle header field will be used for the document title
in the PDF metadata instead of the title header field.
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