make py lib a self-contained directory again

- move and merge _py/ bits back to py/
- fixes all around

--HG--
branch : trunk

py/impl/path/gateway/channeltest2.py

@@ -0,0 +1,21 @@
+import py
+from remotepath import RemotePath
+
+
+SRC = open('channeltest.py', 'r').read()
+
+SRC += '''
+import py
+srv = PathServer(channel.receive())
+channel.send(srv.p2c(py.path.local("/tmp")))
+'''
+
+
+#gw = execnet.SshGateway('codespeak.net')
+gw = execnet.PopenGateway()
+gw.remote_init_threads(5)
+c = gw.remote_exec(SRC, stdout=py.std.sys.stdout, stderr=py.std.sys.stderr)
+subchannel = gw._channelfactory.new()
+c.send(subchannel)
+
+p = RemotePath(subchannel, c.receive())