Make doc-view's pdf->png conversion customizable

[Elias Pipping]

Hello,

mupdf[1] provides the program "pdfdraw" that can convert pdf files to
png images. I've attached a patch to doc-view.el (against the emacs-23
branch, can be applied to 23.3 without any changes as well) that (most
prominently) adds a new (customizable) variable
doc-view-pdf->png-converter-invocation, which can be set to one of the
pre-defined functions

  doc-view-pdf->png-converter-invocation-ghostscript
  doc-view-pdf->png-converter-invocation-mupdf

or a user-specified function. doc-view-pdf/ps->png and
doc-view-pdf/ps->png-1 were made to use them.


Best regards,

Elias Pipping

[1] http://mupdf.com/

0001-Make-doc-view-pdf-png-1-customizable.patch
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