Amend unit tests

nogil_test/cypclass_test___new__.pyx

 cdef cypclass SomeMemory:
   int a
-  SomeMemory __new__():
+  SomeMemory __new__(self):
     o = new SomeMemory()
     o.a = -2
     return o
 
-  void* __new__(int a):
+  void* __new__(self, int a):
     o = new SomeMemory()
     o.a = a
     return <void*> o
 
-  void __init__():
+  void __init__(self):
     this.a += 1
 
-  void __init__(int a):
+  void __init__(self, int a):
     pass
 
 cdef int foo():

nogil_test/cypclass_test_constructor.pyx

 cdef cypclass SomeMemory:
   int a
-  void __init__(int a):
+  void __init__(self, int a):
     this.a = a
-  void __init__(int a, int b):
+  void __init__(self, int a, int b):
     this.a = a*b
 
 cpdef foo():

nogil_test/cypclass_test_constructor_optional_arguments.pyx

 cdef cypclass SomeMemory:
   int a
-  void __init__(int a, int b=1):
+  void __init__(self, int a, int b=1):
     this.a = a*b
 
 cpdef foo():

nogil_test/cypclass_test_inheritance.pyx

 cdef cypclass SomeMemory:
   int a
-  void __init__(int a):
+  void __init__(self, int a):
     this.a = a
-  void __init__(int a, int b):
+  void __init__(self, int a, int b):
     this.a = a*b
 
 cdef cypclass SomeSubMemory(SomeMemory):
 
-  void __init__(int a, int b):
+  void __init__(self, int a, int b):
     this.a = a+b
 
-  int getter():
+  int getter(self):
     return this.a
 
 cpdef foo():