verify: moved threat score location in Contingency2x2 summary output

Threat score is an accuracy metric, equitable threat score is a skill score
using threat score as the accuracy metric and TS for a random forecast as the
reference. Threat score was therefore moved to 'stats' while ETS stayed in
'skill' on printing the verbose summary output.

verify.py

@@ -924,8 +924,8 @@ def summary(self, verbose=False, ci=None):
         if verbose:
             print('Contingency2x2([\n  [{:6g},{:6g}],\n  [{:6g},{:6g}])\n'.format(a,b,c,d))
             qual = ['MajorityClassFraction', 'MatthewsCC']
-            stats = ['Bias', 'FAR', 'PC', 'POFD', 'POD', 'OddsRatio']
-            skill = ['HeidkeScore','PeirceScore','ThreatScore','EquitableThreatScore','YuleQ']
+            stats = ['Bias', 'FAR', 'PC', 'POFD', 'POD', 'ThreatScore', 'OddsRatio']
+            skill = ['HeidkeScore','PeirceScore','EquitableThreatScore','YuleQ']
             print("Summary Statistics")
             print("==================")
             for key in stats: