Reorganized the todo list to reflect present priorities.  The highlights:
1. All remaining vim-mode to-do items have been demoted to wish-list items: leoToDo.txt-->Wishlist-->* Vim to-do
2. The docstring for QScintilla wrapper lists to-do items and states: This widget will likely always be less capable the QTextEditWrapper.

Leo build: 20140910073933