Better tiling (patch included!)

[Sneftel]

Not quite a feature request... more a feature offer, since I've already implemented it in my own code. This is a patch which allows you to specify how your framecomponent/imagerycomponent's tiling behaves. Previously, a horizontal tiling would always expand rightwards, and a vertical tiling would expand downwards. With this patch, the VertFormat and HorzFormat enumerations are expanded to allow explicitly specified tiling directions. This is useful if the right or bottom border is visually "joined" to the background. The change is propagated to the included looknfeel, as well as to the XSD and the Lua bindings.

The patch is available at http://www.cs.ucla.edu/~bsunshin/tiledir.patch.