GUI.pyw: added a Clear button to the directory selection box

data/tools/GUI.pyw

@@ -297,6 +297,13 @@ It comes complete with a context menu and a directory selection screen"""
                                text="Browse...",
                                command=self.on_browse)
         self.dir_button.pack(side=LEFT)
+        self.img=PhotoImage(file="/media/linux/USB DISK/GUI/edit-clear3.gif")
+        self.clear_button=Button(self,
+                                 image=ICONS['clear16'],
+                                 compound=LEFT,
+                                 text="Clear",
+                                 command=self.on_clear)
+        self.clear_button.pack(side=LEFT)
     def on_browse(self):
         # os.path.expanduser gets the current user's home directory on every platform
         if sys.platform=="win32":
@@ -335,6 +342,8 @@ It comes complete with a context menu and a directory selection screen"""
         
         if directory:
             self.textvariable.set(directory)
+    def on_clear(self):
+        self.textvariable.set("")
 
 class WmllintTab(Frame):
     def __init__(self,parent):
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            "cut":PhotoImage(data=b'''
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