hgmerge: add and use ask_if_merged function
This patch, unlike the earlier ones, doesn't use unportable select builtin.
#!/usr/bin/env python
#
# An example CGI script to export multiple hgweb repos, edit as necessary
import cgitb, sys
cgitb.enable()
# sys.path.insert(0, "/path/to/python/lib") # if not a system-wide install
from mercurial import hgweb
# The config file looks like this:
# [paths]
# virtual/path = /real/path
# virtual/path = /real/path
# Alternatively you can pass a list of ('virtual/path', '/real/path') tuples
# or use a dictionary with entries like 'virtual/path': '/real/path'
h = hgweb.hgwebdir("hgweb.config")
h.run()