testrunner.py: convert path to testresults.sqlite3 to work with tests that chdir (test__doctests.py)

--HG--
extra : transplant_source : l%21g%5B%B8B%B6%BA%DElz%9F%A6%5E%23%C9%B9%8E%20%18

--HG--
extra : transplant_source : %A5%5B%ED%F9%7C.%CA%84%18%A6%AD%93%2A%03%90%C6%B9%E0%D8%1F

--HG--
extra : transplant_source : p%03%AA%98Y%87%06%F1%F2O%7B%B3qnL%066%1F%A9%21

--HG--
extra : transplant_source : iM%EB%AA%A7%25hy%5Cn%81%3F%DDp%25%EE%D2%E1%A8g

--HG--
extra : transplant_source : %8D%01%FEP%F6%14d%15%C5%26V%FA%7B%CBx7GC%967

gevent.monkey: add patch_httplib() function and 'httplib' argument to patch_all() (disabled by default)

core: add http_request_client and add support for initiating connections to http_connection (issue #9).

Based on the patch by Tommie Gannert, Örjan Persson.

server: remove _allowed_ssl_args, allow any arguments to be passed (including 'ciphers' which was not included into _allowed_ssl_args)

Use write-only event for connections on non-windows systems (issue #31). Thanks to Alexey Borzenkov for figuring it out.

websocket package is adapted to that

pywsgi: do not add CONTENT_TYPE to the environ dict when there's no Content-Type header in the request

wsgi: fix issue #58: even if http_request instance is leaked, reply with 500 error immediatelly when application raises an error. Thanks to Jon Aslund.

this is needed for websocket which needs to own the connection

pywsgi: ignore errors that happen when socket is closed (for example if it was  already closed by websocket handler)

pywsgi: do not use chunked transfer encoding in case of 304 and 204 responses as it creates a non-empty message body which is against RFC and causes some browsers to fail. Based on the patch by Nicholas Piël.