[BUG] Indentation of LOOP

[Tobias C. Rittweiler]

By default LOOP is indented as follows

  (loop for x in '(a b c)
     for y in '(1 2 3)
     collect (cons x y))

Setting the following

  (setq lisp-simple-loop-indentation 1
        lisp-loop-keyword-indentation 6
        lisp-loop-forms-indentation 6)

makes it be indented like

  (loop for x in '(a b c)
        for y in '(1 2 3)
        collect (cons x y))

which I think is more readable, and more canonical.

I hence propose to change the default values of the above variables
accordingly.

This affects both Elisp as well as Common Lisp code.

  -T.