it has always been the case that RowSpans are signed
it has always been the case that RowSpans are signed

we just get away with this because we cast it to signed before use in
ww8

Change-Id: I646ea3a0eb84923dd9835f18356d67f4f72ba18d

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