org-odt.el: Support for captioning and labelling of equation images

org-odt.el: Support for captioning and labelling of equation images

* contrib/lisp/org-lparse.el (org-do-lparse): let-bind
org-lparse-opt-plist to current export options.
* contrib/lisp/org-odt.el
(org-odt-begin-office-body): Add a directive so that Equations
can be sequentially numbered.
(org-export-odt-preprocess): Removed call to
org-export-odt-preprocess-latex-fragments.
(org-export-odt-preprocess-latex-fragments): Fix signature and
hook it to org-export-preprocess-after-blockquote-hook. Use
org-lparse-opt-plist.
(org-odt-unload-function): Leave no trace in
org-export-preprocess-after-blockquote-hook.

Thanks to Myles English for registering this requirement.
http://lists.gnu.org/archive/html/emacs-orgmode/2011-08/msg01116.html