The `preproc:param-dim' template must remain for now, as it is used by
others.
* src/current/include/preproc/symtable.xsl
(preproc:symtable)[lv:param]: Extracted template.
* src/symtable/symbols.xsl
(preproc:symtable)[lv:param]: Added template.
* test/symtable/symbols.xsl
(lv:param): Scenario added.