Log Message:
Update teixsl-html to 3.1.

Changes in 3.1:
	* latex/teilatex.xsl: support q[@rend='eg']
	* html/teihtml-struct, common/teicommon.xsl: move handling of
	cross-referenced headers to common
	* makeURL to makeHyperLink, and be common
	* revised structure to separate out fo, latex, common, html