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templater: return data in increasing chunk sizes

Currently hgweb is not streaming its output -- it accumulates the
entire response before sending it. This patch restores streaming
behaviour. To avoid having to synchronously write many tiny fragments,
this patch also adds buffering to the template generator. Local
testing of a fetch of a 100,000 line file with wget produces a slight
slowdown overall (up from 6.5 seconds to 7.2 seconds), but instead of
waiting 6 seconds for headers to arrive, output begins immediately.

#!/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)