Optimize Seam Remoting XML Marshalling

The XML marshalling used by Seam Remoting can be optimized significantly by making a few, relatively simple, changes.
1. Making some element names shorter, specifically 'member'.
2. Resolving object fields by position instead of by name. This eliminates the need for the 'name' attribute of the 'member' element.
3. Handling nulls pointers in structures in a simpler way: Use an empty 'member' element.
4. Removing some of the wrapper elements around primitive types.

In our examples we've seen that the optimized XML is less than 40% of the size of the original XML.