Fix 'group' as single voice bug

sonogram.py

@@ -199,7 +199,7 @@ class Sonogram():
                     individuals.add(sas[j])
             if silenceCount > windowSize / 2:
                 decision = 'silence'
-            elif groupCount > windowSize / 2 or len(individuals) > 2:
+            elif sas[i] == 'group' or groupCount > windowSize / 2 or len(individuals) > 2:
                 decision = 'group'
             else:
                 decision = 'individual'
@@ -217,7 +217,7 @@ class Sonogram():
             if cat == 'group': 
                 timeStepMembers[i] = '+'.join(timeStepMembers[i])
             elif cat == 'individual':
-                timeStepMembers[i] = timeStepMembers[i][0]
+                timeStepMembers[i] = sas[i]
             else:
                 timeStepMembers[i] = None