Deprecate commands.getstatus().

Doc/lib/libcommands.tex

@@ -39,6 +39,10 @@ and the return value is a string containing the command's output.
 Return the output of \samp{ls -ld \var{file}} as a string.  This
 function uses the \function{getoutput()} function, and properly
 escapes backslashes and dollar signs in the argument.
+
+\deprecated{2.6}{This function is nonobvious and useless,
+                 also the name is misleading in the presence of
+		 \function{getstatusoutput()}.}
 \end{funcdesc}
 
 Example: