[CM] Snd 20.6

[bil at ccrma.Stanford.EDU]

Snd 20.6:

added case.scm: case* a pattern-matching extension of case
       regex.h entries to libc.scm
       s7_c_pointer_with_type
       notcurses_s7.c, an FFI to the notcurses library
       nrepl.scm, an improvement of repl.scm that uses notcurses 
(work-in-progress)
       nrepl.c: call nrepl.scm without the need to load libc.scm or 
notcurses_s7.so
       *autoload-hook*
       open-input|output-function (scheme versions of the existing C 
functions)

changed subvector parameters to (subvector vect start end 
new-dimensions)
   Here's a translator from the old to the new versions:

     (define (old-subvector vect len (offset 0))
       (if (pair? len)
           (subvector vect offset (+ offset (apply * len)) len)
           (if (not len)
               (subvector vect offset (vector-length vect))
               (subvector vect offset (+ offset len)))))

checked: OSX 10.15.5, FreeBSD 12.1, sbcl 2.0.7

Thanks!: Daniel Hensel, Kjetil Matheussen, Christos Vagias