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Windows: improve performance via buffered I/O

The posixfile_nt code hits the win32 file API directly, which
essentially amounts to performing a system call for every read and
write. This is slow.

We add a C extension that lets us use a Python file object instead,
but preserve our desired POSIX-like semantics (the ability to rename
or delete a file that is being accessed).

If the C extension is not available (e.g. in a VPS environment
without a compiler), we fall back to the posixfile_nt code.

#!/usr/bin/env python
#
# An example CGI script to use hgweb, edit as necessary

# adjust python path if not a system-wide install:
#import sys
#sys.path.insert(0, "/path/to/python/lib")

# enable importing on demand to reduce startup time
from mercurial import demandimport; demandimport.enable()

# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb
#cgitb.enable()

# If you'd like to serve pages with UTF-8 instead of your default
# locale charset, you can do so by uncommenting the following lines.
# Note that this will cause your .hgrc files to be interpreted in
# UTF-8 and all your repo files to be displayed using UTF-8.
#
#import os
#os.environ["HGENCODING"] = "UTF-8"

from mercurial.hgweb.hgweb_mod import hgweb
import mercurial.hgweb.wsgicgi as wsgicgi

application = hgweb("/path/to/repo", "repository name")
wsgicgi.launch(application)