[PATCH][RESEND] Writer - cross-references to numbered paragraphs still wrong (bug ID 36960)

[Troy Rollo]

Bug 36960 was never fixed correctly (or rather, I suspect it was fixed, then 
broken when work was done to make the tests pass). The attached patch fixes 
the bug and adds new tests for cross-references to numbered paragraphs. The 
nature of the bug is that if you have numbered paragraphs like this:

   1. one
        (a) two
        (b) three
   2. four
        (a) five

a cross reference in paragraph 2(a), to paragraph 1(a), returns "1.(a)", which 
is not correct.
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