+Modifications by Franz Steinhaeusler 08.Feb.2006:
+ - tried to meet the wxPython Style Guide
+ (http://wiki.wxpython.org/index.cgi/wxPython_20Style_20Guide)
+ (also take care to use id's as less as possible)
+ - added docstrings
+ - used wx Namespace (recommend use after wxPython 2.5)
+ and Bind instead directly EVT_MENU
+ - set indentation to 4 spaces
+ - used MsgDlg for better overview
+ - added info (for adding or removing files without a root item)
+ - completed the menu function: File open.
+ - if a file was changed, and you want to quit the app, you are now
+ asked to save the file.
+ - there was a traceback with self.tree.GetFirstChild(self.root). fixed.
+ - close handler (save file, if you also close with mouse or alt-F4)
+
+Modifications by Chris Barker, 08.Feb.2006:
+ - changed first line to #!/usr/bin/env python.
+ - Removing a bunch of superfluous IDs of the menu items and
+ event handlers and in splitterwindow.
+
+Modifications by Franz Steinhaeusler 08.Feb.2006:
+ - added short program description.
+ - removed the string module (it is somewhat "deprecated".
+ - added some comments
+ - changed treecontrol to default style.
+ (I think, because of the plus and minus signs,
+ it is much clearer then, whether the root
+ item is empty or not. If there is no sign, the
+ root item doesn't have any children).
+
+
+