clarified NEWS: document_files are officially required since Isabelle2014, but the absence was tolerated as legacy feature;
%%
%% default hyperref setup (both for pdf and dvi output)
%%
\usepackage{color}
\definecolor{linkcolor}{rgb}{0,0,0.5}
\usepackage[colorlinks=true,linkcolor=linkcolor,citecolor=linkcolor,filecolor=linkcolor,pagecolor=linkcolor,urlcolor=linkcolor]{hyperref}