more efficient Markup_Tree, based on branches sorted by quasi-order;
renamed markup_node.scala to markup_tree.scala and classes/objects accordingly;
Position.Range: produce actual Text.Range;
Symbol.Index.decode: convert 1-based Isabelle offsets here;
added static Command.range;
simplified Command.markup;
Document_Model.token_marker: flatten markup at most once;
tuned;
%% toc
\newcommand{\tocentry}[1]{\cleardoublepage\phantomsection\addcontentsline{toc}{chapter}{#1}
\@mkboth{\MakeUppercase{#1}}{\MakeUppercase{#1}}}
\setcounter{secnumdepth}{2} \setcounter{tocdepth}{2}
%% references
\newcommand{\secref}[1]{\S\ref{#1}}
\newcommand{\chref}[1]{chapter~\ref{#1}}
\newcommand{\Chref}[1]{Chapter~\ref{#1}}
\newcommand{\appref}[1]{appendix~\ref{#1}}
\newcommand{\Appref}[1]{Appendix~\ref{#1}}
\newcommand{\figref}[1]{figure~\ref{#1}}
\newcommand{\Figref}[1]{Figure~\ref{#1}}
%% ML
\newenvironment{mldecls}{\par\noindent\begingroup\def\isanewline{\\}\begin{tabular}{ll}}{\end{tabular}\medskip\endgroup}
%% Isar
\newcommand{\isasymBBAR}{{\,\newdimen{\tmpheight}\settoheight\tmpheight{\isacharbar}\rule{1pt}{\tmpheight}\,}}
\isafoldtag{noproof}\def\isafoldnoproof{~\isafold{proof}}
%% math
\newcommand{\isasymstrut}{\isamath{\mathstrut}}
\newcommand{\isasymvartheta}{\isamath{\,\theta}}
\newcommand{\isactrlvec}[1]{\emph{$\overline{#1}$}}
\renewcommand{\isadigit}[1]{\isamath{#1}}
\newcommand{\text}[1]{\mbox{#1}}
%% global style options
\pagestyle{headings}
\sloppy
\isabellestyle{it}
\underscoreon
\renewcommand{\isacharunderscore}{\_}
\renewcommand{\isacharunderscorekeyword}{\_}
\newcommand{\isasymdash}{\mbox{-}}