* Rename core_.pyx to core.ppyx and use C preprocessor macros here instead of m4 macros

--HG--
rename : gevent/core_.pyx => gevent/core.ppyx

gevent is now using libev and requires at least python 2.5.

run configure in build_temp instead and copy the pregenerated
ares_build.h.dist to build_temp on windows.

Run configure with /bin/sh instead of changing permissions.

some systems come with an outdated unifdef command that doesn't
understand the "-b" option. We now check that beforehand and call
unifdef without the -b option.

fixes "python2.7 array.array doesn't support memoryview used in
gevent.socket.send" issue
(http://code.google.com/p/gevent/issues/detail?id=94)

this makes test__select.py compatible with py.test and makes it
possible to run test__select.py with stdin redirected.

py.test wanted to run the test_get_interrupt and test_put_interrupt
functions, so rename then.

array fails, see http://code.google.com/p/gevent/issues/detail?id=94

we do this by using a custom sdist class. it's also called sdist as
the classname is also used for the warning message about the missing
README.txt and I didn't want to change that.

this forces make to choose the same python executable that is running
setup.py.  if PYTHON is already set, don't overwrite it.

the builtin bin is not available on python 2.5, so don't use it in the
_bin function.

python may not exist (on some of the BSDs) or may be python 3 (on
archlinux). We can now choose an executable by setting the environment
variables PYTHON (or calling make PYTHON=...).

While I'm here, do the same for m4 and cython (environment variables
M4 and CYTHON)

__builtins__ may either be the __builtin__ module or
__builtin__.__dict__. in the latter case typing locals() at the
backdoor prompt spews out lots of useless stuff. In the former case it
just prints "{'__builtins__': <module '__builtin__' (built-in)>,..."

fixes http://code.google.com/p/gevent/issues/detail?id=92

this makes the code a bit cleaner and it's easier to check if we're
using readline in _do_read. we need to do that in order to check for
short post requests.

this contains some failing tests for truncated post requests
(http://code.google.com/p/gevent/issues/detail?id=92)

we exercise the Input class without going through the complete WSGI
toolchain.

this makes test__execmodules.py succeed. while I'm here, also hide the
_pywsgi name.

do not use the current globals() as namespace, rather setup a clean
namespace inside a newly created __main__ module.

the missing "import sys" in test__socket_timeout.py fixed two commits
ago, wouldn't go unnoticed with this change.

Otherwise I'm always confused for a minute until I remember to run
"python testrunner.py"

see http://code.google.com/p/gevent/issues/detail?id=93 for more information

see http://code.google.com/p/gevent/issues/detail?id=93 for more information.