[O] comment bug

[Samuel Wales]

For years we had subtle bugs with commenting and filling.  That got
fixed, but now
comment-start is nil.

Perhaps this is related:

commit 94dd2e52439aba488dbac18bd888efb96ede417c
Author: Nicolas Goaziou <address@hidden>
Date:   Sun Jul 29 00:05:33 2012 +0200

    Rewrite filling functions

    * lisp/org.el (org-fill-context-prefix): New function.
    (org-fill-paragraph, org-auto-fill-function): Use new function.  Also
    handle comments.
    (org-adaptive-fill-function): Remove function.
    (org-get-local-variables, orgstruct++-mode): Don't store now unused
    adaptive-fill* functions.

Thanks.

Samuel

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