testing: add TB interface (intersection of T and B's methods) (CL 12962043).
text/template: add comparison functions (CL 13091045).
text/template: dereference pointer values when evaluating args escape funcs (CL 13257043).
+text/template: allow {{else if ... }} to simplify if chains (CL 13327043).
time: Allow Parse and Format to handle time zone offsets with seconds (CL 8132044)
time: patterns require non-lowercase letter to follow Mon, Jan etc (CL 12448044).
unicode: add In, a nicer-to-use but equivalent version of IsOneOf (CL 11672044).