Don't create lots of intermediate files

[evanlenz]

Find another way to create side effects in Saxon-HE (besides using xsl:result-document to write them all to the file system). The tool currently outputs a separate file for every instantiation of a template rule, and this can get unwieldy with larger projects, especially with anti-virus programs having to scan so many newly-created files.

It looks like fn:transform() will work to do just what we need for this. Work is in progress...