Fix off-by-one error in command-line argument handling.

Previously (command-line) did not include the script name, but did
include the executable name if no script was given.  Now if a script
is given its name will be the first element of the list returned by
(command-line) and will be the first element of the list passed to
(main).

This brings us into compliance with SRFI-22.  Our man page was already
correct on this point.

benchmarks/shootout/binarytrees.chibi

@@ -27,7 +27,7 @@
 (define (print . args) (for-each display args) (newline))
 
 (define (main args)
-  (let* ((n (string->number (car args)))
+  (let* ((n (string->number (cadr args)))
          (min-depth 4)
          (max-depth (max (+ min-depth 2) n))
          (stretch-depth (+ max-depth 1)))

benchmarks/shootout/chameneos-redux.chibi

@@ -101,7 +101,7 @@
       (spell (apply + (map car results)))
       (newline))))
 
-(let ((n (command-line #:args (n) (string->number n))))
+(let ((n (string->number (cadr (command-line)))))
   (go n '(blue red yellow))
   (go n '(blue red yellow red yellow blue red yellow red blue))
   (newline))

main.c

@@ -442,7 +442,7 @@ void run_main (int argc, char **argv) {
   if (! quit) {
     load_init();
     if (i < argc)
-      for (j=argc-1; j>i; j--)
+      for (j=argc-1; j>=i; j--)
         args = sexp_cons(ctx, tmp=sexp_c_string(ctx,argv[j],-1), args);
     else
       args = sexp_cons(ctx, tmp=sexp_c_string(ctx,argv[0],-1), args);

tools/chibi-doc

@@ -664,16 +664,17 @@ div#footer {padding-bottom: 50px}
 
 (define (main args)
   (case (length args)
-    ((0)
+    ((0 1)
      (convert (current-input-port)))
-    ((1)
+    ((2)
+     (let ((name (cadr args)))
        (cond
-      ((equal? "-" (car args))
+        ((equal? "-" name)
          (convert (current-input-port)))
-      ((file-exists? (car args))
+        ((file-exists? name)
-       (call-with-input-file (car args) convert))
+         (call-with-input-file name convert))
         (else
          (extract (map (lambda (x) (or (string->number x) (string->symbol x)))
-                     (string-split (car args) #\.))))))
+                       (string-split name #\.)))))))
     (else
      (error "usage: chibi-doc [<file-or-module-name>]"))))

tools/chibi-ffi

@@ -1358,6 +1358,7 @@
 ;; main
 
 (define (main args)
+  (if (not (null? args)) (set! args (cdr args)))
   (let* ((compile? (and (pair? args) (member (car args) '("-c" "--compile"))))
          (args (if compile? (cdr args) args))
          (cflags (if (and (pair? args) (member (car args) '("-f" "--flags")))

tools/chibi-genstatic

@@ -150,6 +150,7 @@
   (display " },\n"))
 
 (define (main args)
+  (if (not (null? args)) (set! args (cdr args)))
   (find-c-libs
    (if (and (pair? args) (member (car args) '("-x" "--exclude")))
        (map (lambda (m)