This is a second attempt to fix the problems addressed by 69bbe627a9.
Because table cell classes needed to use the same initialization code as the NS_initWithCoder methods, it was necessary to refactor the initialization code into separate NS_initWithCell methods and call them separately from NS_initWithCoder.
- Get the scroller orientation from the xib.
- Fix the nonsensical calculation of _isVertical when given bounds.
- Since orientation comes from the xib, had to re-nib2cib everything to be safe.