of subsequent cells in reflow pass 1
we correctly distribute extra space in a table proportionately.
We try to give the extra space to auto-width columns first,
and if there are none we distribute it to all columns.
The percentage is based on the cell content's desired size.
git-svn-id: svn://10.0.0.236/trunk@4722 18797224-902f-48f8-a5cc-f745e15eee43