Table UI Changes

[Taoh Green]

• improve the boolean field to use more friendly icons (we'll need a couple custom icons perhaps) instead of True/False (this will break some tests but should be easily correctable

• allow table column headers to show a description upon hover (if a description is passed in the schema field)
• do not show the column header tooltip if there is not overflow
• make sure the overflow tooltip does not get repeated upon dragging/resizing the column header

[Thomas Willheim]

@tgreen7 these have all been completed, right?

[Taoh Green]

@tnrich yep!