[O] Compiler warnings on current HEAD

[Achim Gratz]

I still get the following warnings w/ GNU Emacs 23.2.1 on the current
HEAD:

In org-footnote-all-labels:
org-footnote.el:336:62:Warning: reference to free variable `rtn'
org-footnote.el:352:74:Warning: assignment to free variable `rtn'

In org-footnote-normalize:
org-footnote.el:531:41:Warning: reference to free variable
    `org-export-footnotes-seen'
org-footnote.el:568:19:Warning: org-fill-paragraph called with 0 arguments,
    but requires 1
org-footnote.el:574:49:Warning: reference to free variable
    `org-export-footnotes-data'
org-footnote.el:653:17:Warning: assignment to free variable
    `org-export-footnotes-seen'

In end of data:
ob-ref.el:265:1:Warning: the following functions are not known to be defined:
    org-id-find-id-in-file, org-show-context


Regards,
Achim.
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