Mark a few functions as obsolete

Mark a few functions as obsolete

* lisp/ob-R.el (org-babel-variable-assignments:R):
* lisp/ob-ref.el (org-babel-ref-goto-headline-id):
* lisp/org-agenda.el (org-agenda-prepare-window):
(org-agenda-switch-to):
* lisp/org-capture.el (org-capture-goto-target):
* lisp/org-clock.el (org-clock-goto):
(org-clock-special-range):
* lisp/org-ctags.el (org-ctags-visit-buffer-or-file):
* lisp/org-eshell.el (org-eshell-open):
* lisp/org-feed.el (org-feed-show-raw-feed):
* lisp/org-id.el (org-id-goto):
* lisp/org-irc.el (org-irc-visit-erc):
* lisp/org-macs.el (org-string-nw-p):
* lisp/org-mobile.el (org-mobile-apply):
* lisp/org-src.el (org-src-switch-to-buffer):
* lisp/org.el (org-get-location):
(org-tree-to-indirect-buffer):
(org-mark-ring-goto):
(org-refile):
(org-add-log-note):
(org-revert-all-org-buffers):
(org-switchb):
(org-cycle-agenda-files):
(org-submit-bug-report):
(org-goto-marker-or-bmk):
* lisp/ox-html.el (org-html-htmlize-generate-css): Silence byte
  compiler.

The following functions are marked as obsolete:
- `org-string-match-p'
- `org-number-sequence'
- `org-floor*'
- `org-pop-to-buffer-same-window'
- `org-delete-directory'
- `org-buffer-narrowed-p'