Fix a bug when using the __lltrace__ opcode tracer, and a problem sith signed chars in frameobject.c which can occur with opcodes > 127

Add code to read from master_fd in the parent, breaking when we get an OSError
(EIO can occur on Linux) or there's no more data to read.  Without this,
test_pty.py can hang on the waitpid() because the child is blocking on the
stdout write.  This will definitely happen on Mac OS X and could potentially
happen on other platforms.  See the comment for details.

first chunk fed to the decoder started with a BOM, but was longer than 3 bytes.

again.

Found by Victor Stinner. Will backport when 2.5 branch is unfrozen.

Exceptions now are raised in the new style. And a mockup class is
now also new style. Thanks Santiago Pereson.

on Windows buildbots.  The change is a one time fix and will be removed
after a successful buildbot run.

'w'.  Closes bug #1569057.

To be backported once 2.5 branch is unfrozen.

MakedirTests.setUp() can now be removed.

Will backport to 2.5.

the test server thread at most 0.5 seconds to get ready, use an event
variable.

how to kill the process in win32 to use the _handle attribute.

server is available. Hope to not get more false alarms.

be used to catch the last warning issued by the warning framework.

Change test_warnings.py and test_structmembers.py to use this
new contextmanager.