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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.