* gnus-sum.el (gnus-summary-move-article): pass move-is-internal

* gnus-sum.el (gnus-summary-move-article): pass move-is-internal
parameter to invoked gnus-request-move-article; remove the
redundant gnus-sum-hint-move-is-internal variable; apply the marks
all at once instead of once per article
(gnus-summary-remove-process-mark): accept a list of articles as
well as a single article for processing

* gnus-int.el (gnus-request-move-article): add move-is-internal parameter

* nnml.el (nnml-request-move-article): add move-is-internal parameter

* nnmh.el (nnmh-request-move-article): add move-is-internal parameter

* nnmbox.el (nnmbox-request-move-article): add move-is-internal parameter

* nnmaildir.el (nnmaildir-request-move-article): add move-is-internal parameter

* nnimap.el (nnimap-request-move-article): add move-is-internal
parameter and remove the gnus-sum-hint-move-is-internal variable

* nnfolder.el (nnfolder-request-move-article): add move-is-internal parameter

* nndraft.el (nndraft-request-move-article): add move-is-internal parameter

* nndiary.el (nndiary-request-move-article): add move-is-internal parameter

* nndb.el (nndb-request-move-article): add move-is-internal parameter

* nnbabyl.el (nnbabyl-request-move-article): add move-is-internal parameter

* nnagent.el (nnagent-request-move-article): add move-is-internal parameter