fix int wraparound + crash on export of fdo74018-2.docx to doc
fix int wraparound + crash on export of fdo74018-2.docx to doc

nPoints is 16bit and accumulated value wraps around, so use
a 32bit nTotalPoints instead and move 16bit declarations to
use points to confirm no other wraparounds

Change-Id: If97ccb46ed8eb7f4305cdfe328ae83bc2b0c778c

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