Header/Footer: Fixed a few separators rendering problems
Header/Footer: Fixed a few separators rendering problems

Bugs fixed:
 + Some of the separators weren't hidden (zooming out and then zooming
   in is an example)
 + The footer separator wasn't properly placed under footnotes
containers if there was no footer.

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core