fix MANIFEST.in and force MANIFEST generation in sdist command

MANIFEST.in

@@ -16,7 +16,7 @@ include Demos/embed/*
 include Demos/freeze/*
 include Demos/libraries/*
 include Demos/Makefile*
-recursive-include Cython/Debugger/Tests/*
+recursive-include Cython/Debugger/Tests *
 recursive-include Tools *
 recursive-include tests *.pyx *.pxd *.pxi *.py *.h *.BROKEN bugs.txt
 recursive-include tests *_lib.cpp *.srctree

setup.py

@@ -18,6 +18,7 @@ def add_command_class(name, cls):
 from distutils.command.sdist import sdist as sdist_orig
 class sdist(sdist_orig):
     def run(self):
+        self.force_manifest = 1
         if (sys.platform != "win32" and 
             os.path.isdir('.git')):
             assert os.system("git show-ref -s HEAD > .gitrev") == 0