fixed missing import in last commit, thanks Tim

VERSION

@@ -1 +1 @@
-Version 2.4.7-stable+timestamp.2013.06.03.22.16.28
+Version 2.4.7-stable+timestamp.2013.06.03.22.40.40

gluon/sqlhtml.py

@@ -18,6 +18,7 @@ try:
 except ImportError:
     from cgi import parse_qs as psq
 import os
+import copy
 from http import HTTP
 from html import XmlComponent
 from html import XML, SPAN, TAG, A, DIV, CAT, UL, LI, TEXTAREA, BR, IMG, SCRIPT