Use new table style for string escape sequences

chapters/lexicalstructure.tex

@@ -181,19 +181,26 @@ \subsection{Strings}\label{strings}
 literals can be represented using escape codes, i.e., the character is
 preceded by a backslash (\lstinline!\!) within the string. Those
 characters are:
-\begin{longtable}[c]{@{}ll@{}}
-\lstinline!\'! & single quote -- may also appear without backslash in string constants.\\
-\lstinline!\"! & double quote\\
-\lstinline!\?! & question-mark -- may also appear without backslash in string constants.\\
-\lstinline!\\! & backslash itself\\
-\lstinline!\a! & alert (bell, code 7, ctrl-G)\\
-\lstinline!\b! & backspace (code 8, ctrl-H)\\
-\lstinline!\f! & form feed (code 12, ctrl-L)\\
-\lstinline!\n! & newline (code 10, ctrl-J), same as literal newline\\
-\lstinline!\r! & carriage return (code 13, ctrl-M)\\
-\lstinline!\t! & horizontal tab (code 9, ctrl-I)\\
-\lstinline!\v! & vertical tab (code 11, ctrl-K)\\
-\end{longtable}
+\begin{center}
+\begin{tabular}{c l}
+\hline
+\tablehead{Character} & \tablehead{Description}\\
+\hline
+\hline
+\lstinline!\'! & Single quote, may also appear without backslash in string constants\\
+\lstinline!\"! & Double quote\\
+\lstinline!\?! & Question-mark, may also appear without backslash in string constants\\
+\lstinline!\\! & Backslash itself\\
+\lstinline!\a! & Alert (bell, code 7, ctrl-G)\\
+\lstinline!\b! & Backspace (code 8, ctrl-H)\\
+\lstinline!\f! & Form feed (code 12, ctrl-L)\\
+\lstinline!\n! & Newline (code 10, ctrl-J), same as literal newline\\
+\lstinline!\r! & Carriage return (code 13, ctrl-M)\\
+\lstinline!\t! & Horizontal tab (code 9, ctrl-I)\\
+\lstinline!\v! & Vertical tab (code 11, ctrl-K)\\
+\hline
+\end{tabular}
+\end{center}
 
 For example, a string literal containing a tab, the words: \emph{This is},
 double quote, space, the word: \emph{between}, double quote, space, the word: