Wrapper around the text code generation, Used from with tspan and text.
Deals with »tref«, »text« and »tspan«.
tref elements are channeled through »analyzeTspan«. The link gets resolved inside »makeText«. An unreferenced tref elements will be ignored. See also »analyzeUse«, from which some code was copied.
super and sub are generated by Jeszra for text windows with an offset value.
sub and super are 80% of linespace aligned on the ascent or descent. Dealt with in analyzeTspan.