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/WindowMaker.h

@@ -472,6 +472,7 @@ typedef struct WPreferences {
     unsigned int workspace_border_size; /* Size in pixels of the workspace border */
     char workspace_border_position;     /* Where to leave a workspace border */
     char single_click;                  /* single click to lauch applications */
+    int history_lines;                  /* history of "Run..." dialog */
 
     RImage *swtileImage;
     RImage *swbackImage[9];