[PATCH] add xslt_stylesheet_param directive

[SamB]

Hi,
   next try...

   Attached patch adds xslt_stylesheet_param directive processing.
   This is equivalent of xslt parameter passed to xslt_stylesheet, but this
works independently and globally.
   xslt config should be a bit simpler because 'common' xslt variables
don't need to be repeated for each xslt_stylesheet.

   Comments/suggestion are welcomed.

Thanks
  Sam
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