Attached patch adds an option to pre-process the input XML document with the profiling stylesheet, profile.xsl.

While it's possible to do this pre-processing before invoking xmlto, I found this useful as it avoids duplicating the gynmastics xmlto does to control the name of the output.

(It doesn't seem possible to do this with a single xsltproc pass using the combined profiling and transform stylesheets, as for some formats, the transformation isn't done by a direct xsltproc invocation, but is wrapped up in other tools)