this work exposed a few bugs and slow spots, which have been fixed
for the aol page, I added some additional backwards compatibility code
to proportionately distribute width when a fixed-width cell has colspans
1. cellmap couldn't properly delete CellData because definition was unavailable
2. optimized table cells made taller wouldn't shrink when they should because we were not
remembering the previous desired height of the cell.
3. rows were placing cells on the left edge, and not adding in the left margin.
from the prior available width. Some real-world test cases sped up
1-2 orders of magnitude for resize reflow. Initial reflow is unchanged because
we still need to get pass1 metrics on all content.
fixed nsCSSBlockFrame.cpp to take margins into account when computing parent's available width
fixed distribution of excess space to table cells when table is bigger than the content it holds.
not quite finished yet, but better.
Made DidSetStyleContext virtual, since we need to override the behavior in subclasses
Moved attribute setting logic from nsTableCell to nsTableCellFrame
Table Borders are being drawn again : )
Table Padding is being displayed
