Fixes needed for dwt.DWT

[Tower Ty]

DWT.RIGHT and DWT.CENTER still cause segmentation faults when used.

Also there is something wrong with selection of TableItems 

if You use DWT.FULL_SELECTION then the full line of a table is selected 

When you don't use it only the first cell should be selected. This doesn't happen

Extract from SWTdocs ........ Advanced SWT Widgets 1, 2........Tutorial3 Page 3
"The last example implements the FULL_SELECTION style, which means that when you
select a table item, the entire item is highlighted instead of just the first field. "