CowDb release 3.1.1

release 3.1.1:
o Name is now persisted as an attribute--otherwise problems with round trips.
o Symbolic references are now expressed in XML as text content rather than as an attribute--again, to avoid round-trip issues.
o The factory now sports the String eXpress(PNode node) method for expressing nodes as XML.
o Bug fix: Xpress was displaying too many handles. Now its output is similar to Display--only handles with symbolic references are displayed.
o Bind now supports well known names.