Some UI enhancements for the BPEL mapper:

1) Firstly, selecting a line that is not in the 'centre' section of the mapper does nothing.  For instance, in the
attached image clicking on the line (which I've highlighted in yellow) next to either the input or output fields
labelled 'WorkOrderAction' does nothing at all.  Clicking on the actual line either on the left hand side or right hand
side should highlight the entire mapping.

2) When a line arrow is selected in the 'centre' section of the mapper, it is highlighted in green.  However, this stops
at the left hand and right hand edge.  The green bold arrow should continue through to the field on the left and right
for clarity. Perhaps the non-selected lines (in grey) should also continue in the same colour through to the field names.