Copy first-header-footer test from ww8 to ooxml

The test document was converted from doc to docx using MS Word 2010.

Several fixes were required to make this test pass:

- Do not clear the "FirstIsShared" property on page styles, as the code
  instead uses the old fashioned method of translating a Word section
  with "different first page header/footer": two page styles linked
  together, the first page style and the follow page style.
  (Also remove a wrong test case which checks the FirstIsShared property)

- Do not clear the "HeaderIsShared"/"FooterIsShared" properties on the
  first page style, only on the follow page style.

- Actually set the "FollowStyle" property on the first page style to
  link it to the follow page style.  This didn't matter for the very
  first Word section because it was mapped to the default page styles
  "First Page" and "Standard" which are already linked, but it does
  matter for subsequent Word sections.

- For some reason setting a new page style at a section break was
  excluded in the case where the following section had a title page.
  Remove this exclusion.

- The exclusion mentioned in the last point was masking that bnc#751077
  was not entirely fixed.  To resolve that issue:
  When checking if the last paragraph of the section is empty, consider
  not just text content but also shapes.

- Remove a workaround for bnc#780843 involving copying of headers and
  footers from the "Standard" (first section) page style in the case
  where the following section had a title page.  This workaround is no
  longer needed as the test case passes without it.

Change-Id: Iacc9bba0720c11414da3e852892cff301ebbc4fe