Fixes updateLayout to make antiscroll update its dimensions
Builds
Fix to forceFill columns:

 * Use defaultWidth to resize, not current width
 * Avoid reszing columns to widths less than 0, which breaks the table
 * Resize columns proportional to their original width
Fix forceFill so that it only increases col size
Change canAutoResize behavior on default table.

This is a work in progress and will not be merged into master without
discussion of the new spec.

* New behavior uses canAutoResize when forceFill is off.
* Use iterative resizing to compute column widths in case of min/max
  width issues
Checkpoint for Finder behavior
Fix totalSavedWidth again
WIP
Removed 500px limit on max width during resize