#132 Preserve hot page numbers with pdf2index

[David Cramer]

Page numbers in an index generated with autoidx.xsl are
hot. If you use make.index.markup + pdf2index to
remove duplicate page numbers and create page ranges,
however, the hot links back to the page from the index
are lost. It'd be nice to preserver these. Page ranges
could be handled in two ways: either the whole range
links to the first page in the range or each page number
links to that page number. Either is fine.

[David Cramer]

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Part of this turned out to be easy (see attached patch of rev.
1.21 of autoidx.xsl). The only limitation is that when you add
the munged index back into the doc and reprocess it, you get
a semi-spurious "id not found" message from the xsls for each
index term. The ids aren't there, but they will be there in the
fo, so if you go ahead and render the fo, you get the hot index
page numbers you know and love. I'm not sure how to make
the messages go away--seems like you'd need another
parameter to let the xsls know that this is the second pass
and that linkends in the index don't need to be checked. Or
you could just ignore the messages.

[David Cramer]

patch to rev. 1.21 of fo/autoidx.xsl