* lisp/nnmh.el (nnmh-retrieve-parsed-headers): Bind `in-reply-to' and `cur' as

* lisp/nnmh.el (nnmh-retrieve-parsed-headers): Bind `in-reply-to' and `cur' as
temporary variables.

;; Stolen from the latest chaos-1_12 branch.
* lisp/gnus-sum.el (gnus-article-sort-by-author): fixed.
* lisp/gnus-int.el (gnus-retrieve-parsed-headers): Add new optional arguments
`dependencies' and `force-new'; new implementation; call
`retrieve-parsed-headers' if it is found.
* lisp/nnmh.el (nnmh-retrieve-parsed-headers): New function.
* lisp/gnus-sum.el (gnus-select-newsgroup): Use `gnus-retrieve-parsed-headers'
instead of `gnus-retrieve-headers' and `gnus-get-newsgroup-headers-xover' or
`gnus-get-newsgroup-headers'.
* lisp/gnus-int.el (gnus-retrieve-parsed-headers): New function.