Update doc related to c_support_code().

doc/extending/cop.txt

@@ -151,7 +151,7 @@ There are less methods to define for an Op than for a Type:
 
     .. method:: c_support_code()
 
-       Allows you to specify helper functions/structs that the
+       Allows you to specify helper functions/structs (in a string or a list of string) that the
        :ref:`op` needs.  That code will be reused for each apply of
        this op. It will be inserted at global scope.
 

doc/extending/ctype.txt

@@ -114,7 +114,7 @@ the most important ones:
 
     .. method:: c_support_code()
 
-        Allows to add helper functions/structs that the :ref:`type` needs.
+        Allows to add helper functions/structs (in a string or a list of strings) that the :ref:`type` needs.
 
     .. method:: c_compiler()
 

doc/extending/extending_theano_c.txt

@@ -369,7 +369,7 @@ commonly used.
 
 .. method:: c_support_code()
 
-    Returns a string containing some support C code for this op. This code
+    Returns a string or a list of strings containing some support C code for this op. This code
     will be included at the global scope level and can be used to define
     functions and structs that will be used by every apply of this op.
 

theano/gof/op.py

@@ -152,7 +152,7 @@ class CLinkerObject(object):
 
     def c_support_code(self):
         """
-        Optional: Return utility code (a string, or a LIST of strings) for use by a `Variable` or `Op` to be
+        Optional: Return utility code (a string, or a list of strings) for use by a `Variable` or `Op` to be
         included at global scope prior to the rest of the code for this class.
 
         QUESTION: How many times will this support code be emitted for a graph

theano/gof/params_type.py

@@ -655,7 +655,7 @@ class ParamsType(Type):
         return list(sorted(list(c_support_code_set))) + [final_struct_code]
 
     def c_code_cache_version(self):
-        return ((1, 8), tuple(t.c_code_cache_version() for t in self.types))
+        return ((2,), tuple(t.c_code_cache_version() for t in self.types))
 
     # As this struct has constructor and destructor, it could be instanciated on stack,
     # but current implementations of C ops will then pass the instance by value at functions,