cu2qu: remove sub-package, make single module

Lib/fontTools/cu2qu.py

@@ -33,10 +33,8 @@ except ImportError:
     cython.locals = lambda **_: _empty_decorator
     cython.returns = lambda _: _empty_decorator
 
-
 import math
 
-from .errors import Error as Cu2QuError, ApproxNotFoundError
 
 __all__ = ['curve_to_quadratic', 'curves_to_quadratic']
 
@@ -53,6 +51,17 @@ else:
     COMPILED = False
 
 
+class Cu2QuError(Exception):
+    """Base Cu2Qu exception class for all other errors."""
+
+
+class ApproxNotFoundError(Cu2QuError):
+    def __init__(self, curve):
+        message = "no approximation found: %s" % curve
+        super(Error, self).__init__(message)
+        self.curve = curve
+
+
 @cython.cfunc
 @cython.inline
 @cython.returns(cython.double)

Lib/fontTools/cu2qu/__init__.py

@@ -1,15 +0,0 @@
-# Copyright 2015 Google Inc. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from .cu2qu import *

Lib/fontTools/cu2qu/errors.py

@@ -1,10 +0,0 @@
-
-class Error(Exception):
-    """Base Cu2Qu exception class for all other errors."""
-
-
-class ApproxNotFoundError(Error):
-    def __init__(self, curve):
-        message = "no approximation found: %s" % curve
-        super(Error, self).__init__(message)
-        self.curve = curve