HTML::Tree v4 is not entirely backwards-compatible

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+[[!template id=gitbranch branch=smcv/ready/htmlbalance author="[[smcv]]"]]
+
+My one-patch htmlbalance branch fixes incompatibility with HTML::Tree 4.0.
+From the git commit:
+
+    The HTML::Tree changelog says:
+    
+        [THINGS THAT MAY BREAK YOUR CODE OR TESTS]
+        ...
+        * Attribute names are now validated in as_XML and invalid names will
+          cause an error.
+    
+    and indeed the regression tests do get an error.