dtk.cls -----
1.26  2011-07-24  - redefine listings for use with luatex/xetex
1.25  2011-04-28  - recode the XeTeX and luateX part
1.24  2011-04-25  -delete the part for laoding eurosans
                   we now use \euro from eurosym by default. (hv)


dtklogos.cls -----
2.11  2011-04-25  -added \LuaLaTeX (hv)


dtk-pdf.sty --------
1.21  2011-06-22  -typo in header
1.20  2011-04-26  -modified license statement