prefer T1 with searchable underscore (requires proper cm-super fonts);

--- a/src/Doc/JEdit/document/root.tex	Mon May 19 16:14:08 2014 +0200
+++ b/src/Doc/JEdit/document/root.tex	Mon May 19 16:48:29 2014 +0200
@@ -1,4 +1,5 @@
 \documentclass[12pt,a4paper]{report}
+\usepackage[T1]{fontenc}
 \usepackage{supertabular}
 \usepackage{graphicx}
 \usepackage{iman,extra,isar,ttbox}

--- a/src/Doc/Locales/document/root.tex	Mon May 19 16:14:08 2014 +0200
+++ b/src/Doc/Locales/document/root.tex	Mon May 19 16:48:29 2014 +0200
@@ -1,4 +1,6 @@
 \documentclass[11pt,a4paper]{article}
+\usepackage[T1]{fontenc}
+\usepackage[nohyphen,strings]{underscore}
 \usepackage{amsmath}
 \usepackage{isabelle,isabellesym}
 \usepackage{verbatim}