Fix: Column visiblity event listener wasn't being removed on destroy
Fix: Column visiblity event listener wasn't being removed on destroy

The result was that if a table was recreated with FixedColumns and
column visiblity changed, an error would occur as it was trying to
update based on a table that no longer exists. See thread 27343 for
details.

modulexcite/FixedColumns,nickzhuyb/FixedColumns,nickzhuyb/FixedColumns,modulexcite/FixedColumns