New module that has an html_quote function that is imported into both DT_Var...

New module that has an html_quote function that is imported into both DT_Var and DT_Utils to support older code that depends on the function to be in either place.

lib/python/DocumentTemplate/html_quote.py

+# split off into its own module for aliasing without circrefs
+
+from cgi import escape
+
+def html_quote(v, name='(Unknown name)', md={}):
+    return escape(str(v), 1)
+