* org.el: Fix up some lexical scoping warnings, and use dolist

* org.el: Fix up some lexical scoping warnings, and use dolist

* lisp/org/org.el (org-set-regexps-and-options-for-tags, org-goto-map)
(org-set-regexps-and-options, org-assign-fast-keys)
(org-contextualize-keys, org-contextualize-validate-key)
(org-notes-order-reversed-p, org-local-logging, org-map-entries)
(org-find-olp, org-find-exact-heading-in-directory)
(org-cycle-agenda-files, org-release-buffers, org-fill-template)
(org-agenda-prepare-buffers, org-occur-in-agenda-files)
(org-replace-escapes): Use dolist.
(org-mode): Optimize away XEmacs-only code.
(org-refile-get-targets): Remove unused var `f'.
(org-fast-todo-selection): Remove unused var `e'.
(org-make-tags-matcher): Use dolist.  Remove unused var `term'.
(org-fast-tag-selection): Use dolist.  Remove unused var `e'.
(org-format-latex): Use dolist.  Remove unused var `e'.
(org-toggle-heading): Access vars lexically rather than dynamically.
(org-backward-sentence, org-forward-sentence, org-meta-return)
(org-kill-line): Mark arg as unused.
(org-submit-bug-report): Silence compiler warning.
(org-occur-in-agenda-files): Don't use add-to-list on local vars.
(org-get-cursor-date): Remove unused var `tm'.
(org-comment-or-uncomment-region): Use standard name `_'.
(reftex-docstruct-symbol, reftex-cite-format): Declare to
silence byte-compiler.
(org-reftex-citation): Add `org--' prefix to dynamically scoped
`rds' var.