BF: unicode fix for TableWidget

Setting a table item value to a unicode value with non ascii chars would
cause the tablewidget contents to not be displayed (no exception thrown
either).

Changed all instances of str(..) or map(str,...) to use asUnicode and
issue seems to be fixed

pyqtgraph/widgets/TableWidget.py

@@ -103,19 +103,19 @@ class TableWidget(QtGui.QTableWidget):
         if isinstance(data, list) or isinstance(data, tuple):
             return lambda d: d.__iter__(), None
         elif isinstance(data, dict):
-            return lambda d: iter(d.values()), list(map(str, data.keys()))
+            return lambda d: iter(d.values()), list(map(asUnicode, data.keys()))
         elif HAVE_METAARRAY and (hasattr(data, 'implements') and data.implements('MetaArray')):
             if data.axisHasColumns(0):
-                header = [str(data.columnName(0, i)) for i in range(data.shape[0])]
+                header = [asUnicode(data.columnName(0, i)) for i in range(data.shape[0])]
             elif data.axisHasValues(0):
-                header = list(map(str, data.xvals(0)))
+                header = list(map(asUnicode, data.xvals(0)))
             else:
                 header = None
             return self.iterFirstAxis, header
         elif isinstance(data, np.ndarray):
             return self.iterFirstAxis, None
         elif isinstance(data, np.void):
-            return self.iterate, list(map(str, data.dtype.names))
+            return self.iterate, list(map(asUnicode, data.dtype.names))
         elif data is None:
             return (None,None)
         else:
@@ -239,7 +239,7 @@ class TableWidgetItem(QtGui.QTableWidgetItem):
         if isinstance(val, float) or isinstance(val, np.floating):
             s = "%0.3g" % val
         else:
-            s = str(val)
+            s = asUnicode(val)
         QtGui.QTableWidgetItem.__init__(self, s)
         self.value = val
         flags = QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsEnabled