Replace CURIE srings in python code with namespace CURIE references
When saving a view description, check all field property URIs are unique
Refactoring; preparing for change to relative stored URL values
WORK IN PROGRESS: converting to store entity URL path without host
WORK IN PROGRESS: converting to store entity URL path without host - fix entitytgenericedit tests
Store entity URL path without host - cf. issue #4 and issue #32.  All tests pass.