Fixed a bug in safari 7.0.6 where multiple left fixed columns lead to a ...

Fixed a bug in safari 7.0.6 where multiple left fixed columns lead to a wrong calculated DTFC_LeftBodyLiner width. Only in Safari (7.0.6) with a big table that doesn't scroll vertically and 4 fixed left columns, the DTFC_LeftBodyLiner width is wrongly calculated when the browser window is smaller than the table width (when the table has auto auto and is not full-size).

th.outerWidth(), th.innerWidth() and th.width() don't match the value that is set in th's style attribute, so we had to retrieve it from the style attribute string.