* mh-comp.el (mh-forward): Went over all uses of the word "RANGE" in

* mh-comp.el (mh-forward): Went over all uses of the word "RANGE" in
the docstrings and made usage consistent. Generally speaking,
"messages in range" and "range of messages" is redundant and just
"range" can be used in most circumstances. Also ensured that
mh-interactive-range was mentioned in all interactive functions that
use a range which describes the range argument for both users and
programmers.

* mh-e.el (mh-delete-msg-no-motion, mh-refile-msg)
(mh-refile-or-write-again, mh-rescan-folder, mh-undo)
(mh-visit-folder, mh-scan-folder, mh-regenerate-headers)
(mh-notate-user-sequences, mh-delete-msg-from-seq, mh-catchup): Ditto.

* mh-funcs.el (mh-copy-msg, mh-pack-folder, mh-pack-folder-1): Ditto.

* mh-junk.el (mh-junk-blacklist, mh-junk-whitelist): Ditto.

* mh-print.el (mh-ps-print-range, mh-ps-print-msg)
(mh-ps-print-msg-file, mh-print-msg): Ditto.

* mh-seq.el (mh-put-msg-in-seq, mh-range-to-msg-list)
(mh-narrow-to-range, mh-toggle-tick): Ditto.