[PATCH 2 of 2] add xslt_root directive

[SamB]

Hi,
  this patch adds xslt_root directive and prefixes files defined with
xslt_stylesheet or xslt_entities
  directives (if file not specified with absolute path) .

  Note: while stealing code from ngx_conf_full_name() for
ngx_http_xslt_filter_full_name() I noticed
           that there is no ngx_pfree() done on original name characted
array (name->data) when
           replaced by newly allocated memory (ngx_conf_file.c:843).
           Question is: is there a memory leak or I should not do it in my
code ?-)

Thanks
  Sam
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