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
