Col and colgroup tests
fixed table width=200, 2 cols
fixed table width=200, colgroup with 2 cols
fixed table width=200, colgroup span=2 width=50%
100% table, colgroup with 2 cols
variable table, colgroup width=25% with 2 cols, colgroup span=2 width=50
variable table, colgroup with 2 cols, col span=2 width=50