Add history to some dialog boxes

This patch adds history to some dialog boxes. To use it replace %a with
%A in menu file (like in "Run..." menu item). You can specify third
parameter to %A to use different histories for differen dialogs.

All history files is kept in ~/GNUstep/.AppInfo/WindowMaker/ and the number of
history lines controlled by DialogHistoryLines parameter (one for
all dialogs) defaults to 500 lines.

It also adds Tab completion.

Origin: ALT/Sisyphus Linux, Alexey Voinov <voins@altlinux.ru>

src/defaults.c

@@ -692,7 +692,9 @@ WDefaultEntry optionList[] = {
 	{"TextCursor", "(builtin, xterm)", (void *)WCUR_TEXT,
 	 NULL, getCursor, setCursor},
 	{"SelectCursor", "(builtin, cross)", (void *)WCUR_SELECT,
-	 NULL, getCursor, setCursor}
+	 NULL, getCursor, setCursor},
+	{"DialogHistoryLines", "500", NULL,
+	 &wPreferences.history_lines, getInt, NULL}
 };
 
 #if 0