renamed structure TaskQueue to Task_Queue;
tasks are ordered according to priority, which has been generalized from bool to int;
removed unused focus;
tuned dequeue: single pass due to proper priority order;
tuned dequeue_towards;
\documentclass[11pt,a4paper]{article}
\usepackage{isabelle,isabellesym}
\usepackage{pdfsetup}
\urlstyle{rm}
\isabellestyle{it}
\begin{document}
\title{Miscellaneous FOL Examples}
\maketitle
\tableofcontents
\parindent 0pt\parskip 0.5ex
\input{session}
\end{document}