Fix: When multiple columns were fixed, it could cause an offset in the data rendered due to the use of visible elements only. The fix is to use DataTables' cache of cells for the row.
Fix: When multiple columns were fixed, it could cause an offset in the data rendered due to the use of visible elements only. The fix is to use DataTables' cache of cells for the row.

This fix is for 1.10+ only - the bug remains if you are using a legacy
version of DataTables. Unfortunately it would take about 1K of code to
fix it for 1.9-, and since 1.9- is no longer supported I've elected not
to patch this here.

This fixes DataTables/ColVis #34

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