[svn r46011] Branch merge of session cleanups.

* killed _tryiter usage in rsession
* moved reporter one level up, so it can be reused later for normal session
* a lot of small simplifications

--HG--
branch : trunk

py/test/testing/test_config.py

@@ -2,7 +2,6 @@ from __future__ import generators
 import py
 
 from py.__.test.config import gettopdir
-from py.__.test.testing.test_collect import skipboxed
 
 def test_tmpdir():
     d1 = py.test.ensuretemp('hello')