[slim-vim] A better edit mode for Lisp

[Brad Beveridge]

> Now you have 3 windows displaying the functions function1, function2 and function3.

True, and this is often what I do - but moving between windows is more
of a pain than what I would ideally like.  Though, part of the pain is
my own fault - I type Dvorak and jkhl are in different places.  For
normal mode I have remapped h/t to down/up and j/k to left/right -
which works OK.  But I don't think I can remap that combo to moving
between windows.

Brad