[PATCH] Improve org-mouse support for checkboxes

[Jim Porter]

While trying out `org-mouse', I noticed two semi-related issues with 
checkboxes. First, intermediate-state checkboxes (like [-]) aren't 
clickable. Second, if the checkboxes are inside a block and the theme 
gives the block a background color, the block's background is removed 
behind the checkbox. To see both of these in action:

  $ cat file.org
  * Regular
  - [X] Checked.
  - [-] Half-checked.
  - [ ] Not checked.
  * In block
  #+begin_src org
  - [X] Checked.
  - [-] Half-checked.
  - [ ] Not checked.
  #+end_src

  $ emacs -Q --eval '(progn (setq org-modules '"'"'(org-mouse)) 
(custom-set-faces '"'"'(org-block ((t :background "green")))))' file.org

The attached patch fixes both of these issues. For the first problem, 
maybe it would be useful to put the regexp for checkboxes in a variable 
somewhere so it doesn't get out of sync. I wasn't sure though, so I went 
with the simpler solution for now.

My FSF copyright assignment should be on file, but let me know if there 
are any issues there.

0001-org-mouse-Support-intermediate-state-checkboxes.patch
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