Other customisations

Other changes were made by overriding specific XSLT templates in the DocBook XSLT 1.0 stylesheets. This is fully expected for any non-trivial customisation of the stylesheets. The DocBook stylesheets are highly modular, and it was found to be simplest to put overrides in files corresponding to the original module containing the overridden template. For example, muk-lists.xsl overrides some of the templates in list.xsl in the DocBook XSLT 1.0 stylesheets.