Minimize String casting between SwingSet components and RowSet

[bpangburn]

Many SwingSet components use RowSetOps.getColumnText() and updateColumnText() which cast back and forth from java.sql.JDBCType (or java.sql.Types) to String. It would be preferable to eliminate unnecessary castings by storing component values in the appropriate Object type, using RowSet.updateObject() and RowSet.getObject().

[errael]

getBoundColumnText() is used all over, this in turn uses getColumnText()

[bpangburn]

getBoundColumnText() is used all over, this in turn uses getColumnText()

Not a trivial undertaking, but I think getObject() and updateObject() would be better for non-text components. I can be talked out of this and things are much cleaner than they were before with some consolidation in SSCommon and the cleanup done in SSRowSet. If we're doing something like storing a number in a text field then the casting is fine, but there are other places where it seems unnecessary to me.