Prune most-positive-fixnum from Lisp source

I looked through all instances of most-negative-fixnum
and most-positive-fixnum in the Lisp source code, and
when it was easy I removed assumptions that integers
fit in fixnums.  The remaining instances are either
nontrivial to fix, or are inherent to the algorithm.
* lisp/arc-mode.el (archive-l-e): Do not convert to float,
since we have bignums now.  All uses changed.
* lisp/calc/calc.el (math-bignum):
Don’t special-case most-negative-fixnum.
* lisp/calendar/parse-time.el (parse-time-string):
* lisp/emacs-lisp/edebug.el (edebug-read-special):
* lisp/emacs-lisp/package.el (package--remove-hidden):
* lisp/gnus/nnfolder.el (nnfolder-read-folder):
* lisp/international/mule-util.el (filepos-to-bufferpos--dos):
* lisp/menu-bar.el (menu-bar-update-buffers):
* lisp/net/rcirc.el (rcirc-handler-317):
* lisp/org/org-agenda.el (org-cmp-ts):
* lisp/window.el (window--resize-child-windows):
Avoid arbitrary limit to most-positive-fixnum or to
most-negative-fixnum.
* lisp/calendar/time-date.el (days-to-time):
* lisp/erc/erc-dcc.el (erc-unpack-int):
Don’t worry about integer overflow.
* lisp/cedet/semantic/wisent/comp.el (wisent-BITS-PER-WORD):
* lisp/gnus/message.el (message-unique-id):
* lisp/org/org-footnote.el (org-footnote-new):
Simplify.
* lisp/erc/erc-dcc.el (erc-most-positive-int-bytes)
(erc-most-positive-int-msb): Remove; no longer needed.
* lisp/net/imap.el (imap-string-to-integer): Remove; unused.
* lisp/org/org-element.el (org-element--cache-generate-key):
Document fixnum limitation.

1 files changed, 4 insertions, 2 deletions

diff --git a/lisp/calendar/parse-time.el b/lisp/calendar/parse-time.el
index c4727339040..2f9e557dabc 100644
--- a/lisp/calendar/parse-time.el
+++ b/lisp/calendar/parse-time.el
@@ -98,7 +98,7 @@ letters, digits, plus or minus signs or colons."
   `(((6) parse-time-weekdays)
     ((3) (1 31))
     ((4) parse-time-months)
-    ((5) (100 ,most-positive-fixnum))
+    ((5) (100))
     ((2 1 0)
      ,#'(lambda () (and (stringp parse-time-elt)
 			(= (length parse-time-elt) 8)
@@ -170,7 +170,9 @@ any values that are unknown are returned as nil."
 						  'lambda)))
 				    (and (numberp parse-time-elt)
 					 (<= (car predicate) parse-time-elt)
-					 (<= parse-time-elt (cadr predicate))
+					 (or (not (cdr predicate))
+					     (<= parse-time-elt
+						 (cadr predicate)))
 					 parse-time-elt))
 				   ((symbolp predicate)
 				    (cdr (assoc parse-time-elt