setkey method's argument is no longer optional (it used to be a no-op

when missing).

Doc/lib/librotor.tex

@@ -35,9 +35,8 @@ if it is omitted, a default value of 6 will be used.
 Rotor objects have the following methods:
 
 \renewcommand{\indexsubitem}{(rotor method)}
-\begin{funcdesc}{setkey}{\optional{key}}
-Sets the rotor's key to \var{key}.  If \var{key} is not given, this
-function does nothing\footnote{This is for backwards compatibility.}.
+\begin{funcdesc}{setkey}{key}
+Sets the rotor's key to \var{key}.
 \end{funcdesc}
 
 \begin{funcdesc}{encrypt}{plaintext}

Doc/librotor.tex

@@ -35,9 +35,8 @@ if it is omitted, a default value of 6 will be used.
 Rotor objects have the following methods:
 
 \renewcommand{\indexsubitem}{(rotor method)}
-\begin{funcdesc}{setkey}{\optional{key}}
-Sets the rotor's key to \var{key}.  If \var{key} is not given, this
-function does nothing\footnote{This is for backwards compatibility.}.
+\begin{funcdesc}{setkey}{key}
+Sets the rotor's key to \var{key}.
 \end{funcdesc}
 
 \begin{funcdesc}{encrypt}{plaintext}