Datagrids now have a separation of state and definition. This requires

some changes in Column subclasses to make use of the new state

parameters.
As part of the new fixes, we're also able to fix sorting of the review

request ID column, which broke in RC 1.

Unit tests pass.
Added every column. Rearranged columns. Sorted several of them. Removed columns.

Everything worked.
Tested the review request ID column with both global review requests and Local Sites.