Client side xslt processing using SaxonCE and updated inscription2 page formatting

Changed files:
- urls_app.py
- inscription2.html
- static/usep/js
- static/usep/xsl (Elli updated the xsl and said that we would use the local copy for now)
- views.py (added the get_xml() method and deleted deprecated code from the display_inscription2() method)
- models.py (commented out the deprecated Inscription2 class)