print more info in case of an error. Bump version number of TensorType(mostly…

theano/tensor/basic.py

@@ -652,7 +652,7 @@ class TensorType(Type):
         }
         type_num_%(name)s = ((PyArrayObject*)py_%(name)s)->descr->type_num; //we expect %(type_num)s
         if (type_num_%(name)s != %(type_num)s) {
-            PyErr_SetString(PyExc_ValueError, "expected %(type_num)s");
+            PyErr_Format(PyExc_ValueError, "expected type_num %%d (%(type_num)s) got %%d", %(type_num)s, type_num_%(name)s);
             %(fail)s
         }
         %(name)s = (PyArrayObject*)(py_%(name)s);
@@ -698,7 +698,7 @@ class TensorType(Type):
     def c_code_cache_version(self):
         scalar_version = scal.Scalar(self.dtype).c_code_cache_version()
         if scalar_version:
-            return (4,) + scalar_version
+            return (5,) + scalar_version
         else:
             return ()