Fix new JIT to be Python3 compliant

kernel/modelverse_kernel/main.py

@@ -158,7 +158,7 @@ class ModelverseKernel(object):
             node_value, = yield [("RV", [node])]
             if node_value is not None:
                 # There is a value to the node, so replicate the value
-                if isinstance(node_value, (str, unicode)):
+                if isinstance(node_value, string_types):
                     value = '"%s"' % node_value.replace('"', '\\"').replace("'", "\\'").replace('\t', '\\t').replace('\n', '\\n')
                 else:
                     value = str(node_value)

wrappers/modelverse_SCCD.py

@@ -1,7 +1,7 @@
 """
 Generated by Statechart compiler by Glenn De Jonghe, Joeri Exelmans, Simon Van Mierlo, and Yentl Van Tendeloo (for the inspiration)
 
-Date:   Thu May  3 09:33:36 2018
+Date:   Thu May  3 09:37:35 2018
 
 Model author: Yentl Van Tendeloo
 Model name:   MvK Server