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.

html_quote.py

@@ -0,0 +1,7 @@
+# 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)
+