We use a `v' prefix. * tools/vergen (version): Recognize `v'-prefixed tags.
Taken from GNU ease.js. * tools/vergen: Added script.
This makes changes necessary to new ref format (which includes arity). * src/graph.xsl: @ref function arity added * src/preproc/expand/expand-sequence.xsl: @ref function arity added * tools/literate-xsl: Submodule updated