[wish] @preamble support

I'm sorry to hassle you again with a wish I already posted over a year ago, 
but it keeps annoying me ;-)

Pybliographer should support BibTeX's @preamble. This is needed when you are 
working with macros or the extremely useful csquotes package. The situation 
at the moment is that pybliographer just deletes any @preamble{} entry in the 
file.

It could go to the BibTeX settings pane in the preferences dialog. On the long 
run, though, I think that it should be document-specific, not general. I also 
think that the @string's should be document specific, not general (so that 
pybliographer will read the actual @string's from a file, which are currently 
just overwritten by the general ones).

Regards and thanks for all your efforts,
Jürgen.



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