Generate SBS-specific metadata in top-level script

Purpose is to make dtbook-to-odt.convert.xpl and meta.xsl more generic
Provide sbs-content.xsl to dtbook-to-odt.convert.xpl as an input port

Again, purpose is to make dtbook-to-odt.convert.xpl more generic
Renaming of file-utils and dtbook-utils
Make some options into parameters internally
Remove template default.ott