edif and edif2

[Chris Moller]

    Per a suggestion by Christian Robert, edif and edif2
      now support creating and editing named lambdas.  (Though, to be
      honest, the usual way of creating a named lambda,
      fubar←{whatever}, is easier--I just included the "create"
      capability for completeness.  The only real value of lambda mode
      is editing existing lambdas.)
      
      Lambda-editing mode differs from normal function-editing mode in
      that no header is shown in lambda mode (APL creates the header
      based on the alpha (⍺) and omega (⍵) variables in the
      _expression_).  Lambdas also have an implicit λ← assignment; that
      assignment is not shown in the editor.
      
      So, for example, if you create a lambda like
    
> fubar←{3×⍳⍵}
>     
    and then edit it with edif:
    
> edif 'fubar'
>     
    what you'll see is an editor screen containing just
    
> 3×⍳⍵
>     
    
      
      The for-completeness lambda-creation mode can be had by abusing
      the axis argument:
    
> edif [1] 'fubar'
>     
     Further (not that many people will care),
    
> edif [2] ''
>     
    will show the edif version:
    
> APL editor native function 2.2.0
>     
    and 
    
> edif [3] ''
>     
    will show git version information
    
> 08f5d28 2020-07-16 19:52:19 -0400
>     
    
      https://github.com/ChrisMoller/edif
      
      Have fun,
      cm