* cleanup of the way distributed/remote sessions are setup up
* simplified config pickling
* configs are now more correctly wired on receival at remote sides
* introduced py.__.execnet.gwmanage helps managing calls to multiple hosts
* grouping all pickling related tests in test_pickle.py
and showcasing a nice pyfunc_call hack
--HG--
branch : trunk
this merge contains:
* a new plugin architecture
* a pluginized pytest core
* many pytest related refactorings
* refactorings/streamlining of pytest's own tests
--HG--
branch : trunk
hpk