[svn r37741] monster checking for

* unifying IO capturing methods
* py.io.StdCapture and py.io.StdCaptureFD
  (and both have a classmethod 'call' that is
  a shortcut for capturing output while
  executing a function)
* removing lots of duplicate code
* providing some examples in py/doc/io.txt

at least tests on win32 and linux seem
to pass all for me.

--HG--
branch : trunk

py/thread/testing/test_pool.py

@@ -77,7 +77,7 @@ def test_join_timeout():
     pool.join(timeout=0.1) 
 
 def test_pool_clean_shutdown():
-    capture = py.io.OutErrCapture() 
+    capture = py.io.StdCaptureFD() 
     pool = WorkerPool()
     def f():
         pass